Uni-Ball Signo RT1 UMN-155 Gel Pen - 0.28 mm - Light Blue

An excellent pen. I find the pen body very comfortable to use, and the color is practical but unique. This is quickly becoming my go-to pen. When compared to my other favorite gel pen, the Pilot G-2 in the same size, I find that the Uni-ball Signo has slightly more feedback, and the Pilot G-2 is wetter and a tiny bit smoother. As a result, I use my Pilot for notes, where I want to write very quickly and don't care about neatness, and I use the Uni-ball Signo for filling out forms and writing cards - times when handwriting neatness is very important. And I prefer the actual pen of the Uni-ball Signo RT1 UMN-155 over the Pilot G-2. I think it's both more comfortable to use, and prettier to look at.I also own the blue-black not-retractable version (the Uni-ball Signo ... MoreAn excellent pen. I find the pen body very comfortable to use, and the color is practical but unique. This is quickly becoming my go-to pen. When compared to my other favorite gel pen, the Pilot G-2 in the same size, I find that the Uni-ball Signo has slightly more feedback, and the Pilot G-2 is wetter and a tiny bit smoother. As a result, I use my Pilot for notes, where I want to write very quickly and don't care about neatness, and I use the Uni-ball Signo for filling out forms and writing cards - times when handwriting neatness is very important. And I prefer the actual pen of the Uni-ball Signo RT1 UMN-155 over the Pilot G-2. I think it's both more comfortable to use, and prettier to look at.I also own the blue-black not-retractable version (the Uni-ball Signo UM-151), and have compared the two. I think the ink formula is slightly different (presumably so it will work in a retractable model) and I actually prefer the retractable ink - I find it to be wetter and slightly darker (although maybe it is simply more saturated).I hope Uni-ball Signo releases retractable versions of all the other off black colors, particularly Bordeaux Black, Lavender Black, and Green Black. I would buy them in a heart beat, even though I already own the traditional Gel pen version. I like the retractable version that much.

Pen Body: The Signo RT1 pen is hands-down my favorite. I’m left-handed and “underwrite” (as described in JetPen’s left-handers guide) and its width and don’t-let-my-hand-slip rubbery grip give me just the right control and comfort level as I drag my words across the page.These pens are also super durable and easy to refill.Pen Ink: I usually use the .38 but wanted to try out the smaller size. It was still very readable and the ink was consistent, very minimal skipping. I tested writing both slowly and quickly. It was very satisfying to be able to write so small so comfortably and have it so readable. I'll definitely be getting more .28s.There is a little more feedback or scratchiness than the .38 (and more so than even the .3 Energel), but far less than the .3 ... MorePen Body: The Signo RT1 pen is hands-down my favorite. I’m left-handed and “underwrite” (as described in JetPen’s left-handers guide) and its width and don’t-let-my-hand-slip rubbery grip give me just the right control and comfort level as I drag my words across the page.These pens are also super durable and easy to refill.Pen Ink: I usually use the .38 but wanted to try out the smaller size. It was still very readable and the ink was consistent, very minimal skipping. I tested writing both slowly and quickly. It was very satisfying to be able to write so small so comfortably and have it so readable. I'll definitely be getting more .28s.There is a little more feedback or scratchiness than the .38 (and more so than even the .3 Energel), but far less than the .3 Zebra Sarasa Clip. I actually prefer a *little* feedback as it helps me control my speed and handwriting, but wanted to note it as I know not everyone is a fan.All in all, this pen is a marvel!

The Uni-ball Signo RT1 is an excellent gel pen, which replaced previous RT. I have difficult time understanding why Uni-ball offers two almost identical models, the other one being Signo 307 (which replaced model 207). Both RT1 and 307 are pigment water based gel pens offering acid-free and fade resistant inks archival quality inks. Both RT1 and 307 are similarly priced, however the 307 ink formulation is slightly different as it includes cellulose nanofiber. In practical use however I could see no difference - both pens are skip free, do not railroad (as is expected for a good 0.5mm gel ink pen), and both lay down on paper beautiful, deep black lines. There is very slight smudging of fresh letters, so depending on speed of writing and pen holding technique they may ... MoreThe Uni-ball Signo RT1 is an excellent gel pen, which replaced previous RT. I have difficult time understanding why Uni-ball offers two almost identical models, the other one being Signo 307 (which replaced model 207). Both RT1 and 307 are pigment water based gel pens offering acid-free and fade resistant inks archival quality inks. Both RT1 and 307 are similarly priced, however the 307 ink formulation is slightly different as it includes cellulose nanofiber. In practical use however I could see no difference - both pens are skip free, do not railroad (as is expected for a good 0.5mm gel ink pen), and both lay down on paper beautiful, deep black lines. There is very slight smudging of fresh letters, so depending on speed of writing and pen holding technique they may not be the best choice for left handed use. However after a few seconds the letters are completely touch, water and most other liquids resistant.Both RT1 and 307 refills are mechanically identical, so one can mix and match. The body of the RT1 is a bit translucent, so when you place it against a strong light source you can see how much ink is left. The cone, body and the clip are all plastic, making the pen light. The bottom part of the pen is made from rubber-like material which is comfortable to hold - not too soft, not too hard, and does not attract the dust or dirt. The clip however is not the best design: it is all plastic, does not look to be very strong, so if you want to keep the pen securely in your pocket look for a stronger clip design (like Zebra Sarasa or Pilot Juice series with proper metal springs). When you extend the refill to write the mechanism rattles if you shake the pen (but not when you write) - this normal with most (but not all) pens.The RT1 refill has what Uni-ball calls “the edgeless rounded tip” - maybe not completely edgeless, but it reduces friction against the paper a bit. Depending on paper used (try Rhodia) it provides some feedback, without being excessively scratchy. It comes with 0.28mm, 0.38mm and 0.5mm (as far as I know no 0.7mm) and in different ink/body colours. I find 0.5mm to be “just right”. The range of colours is not as extensive as some other lines and brands, but pretty good nevertheless.

I bought the Black in the 0.28 and 0.38 mm tips after trying the 0.5 mm one, which laid down too much ink for my writing style. These smaller tips were perfect for smaller spaces; even if they are tiny, they both have vibrant and rich ink that looks black, not grey. The tips are not scratchy, but I do feel the texture of the paper under them; if I write with smooth paper, the pens are very smooth. They are comfortable to hold, and I like the click mechanism. I find the 0.38 mm RT1 smoother than the same-sized Signo DX. Sometimes, I write with these pens on larger ruling just because I like them so much, even if there’s need to go that thin. Even so, the text remains readable and doesn’t look like a spider’s web!

Ehhhhhh I don't understand the hype. Lots of mentions of the Signo high on the fine tip everyday writing category, but it fell short for me.Really the writing just isn't as smooth and effortless as others. It feels like a standard ballpoint and just takes too much pressure and effort to keep a clean line. Not necessarily skipping but just takes pressure to write. By comparison the EnerGel 0.4 is much much smoother, almost slippery, and the Sarasa series are a great middle ground. I do like the Signo grip going so far down to the tip. Overall it feels pretty cheap and light.

A good retractable gel pen but didn't quite like the opacity of the green ink by Uni Mitsubishi pen. It was like very light green and it is hard to read for 0.5mm thickness. The pen's body is very sleek and comfortable writing with it, and also twirling within the fingers. Kind of fun to play it. I would choose a green black shade of ink. Nice pen!

I love my Uni-ball Signo RT1 UMN-155 Gel Pen! I bought it as a test to see if I would like it. I really didn't think I would (in fact I kept deleting it from my cart and adding it back until I finally decided to just give in and try it), but it turns out to now be one of my favorite pens! I love the way it feels in my hand as I write. The ink flows smoothly. The rubber grip is comfortable. And I love the ease of clicking to extend/retract the tip. This pen is definitely on my list to buy again!

Smooth writing with a perfectly-sized ink line that allows for greater detail in writing. The .5 mm line allows for finer details with your text and drawings. I wrote a few lines and someone said it looked like it was "typed" script. I take that as a compliment.

The Uni-ball Signo RT1 0.38mm pens have become my new everyday favorite! I have cubital tunnel and slight tendinitis in my left hand, and I have pretty small hands, so I have struggled to find a pen that I can write comfortably with for more than 10 minutes. These are it!!! Many pens are either too long, too thick/thin, or too heavy for me (like the Dr.Grip that many people have good luck with). These pens are just heavy enough, fit nicely in my hand without the "death grip" and these pens glide SUPER smooth for me. I definitely was not expecting such smooth writing with my first 0.38mm pen. With the grip being so comfortable and down close the tip, as well as Uni-ball's fabulous gel ink, I can take observations, notes, and do work without constant hand cramps. ... MoreThe Uni-ball Signo RT1 0.38mm pens have become my new everyday favorite! I have cubital tunnel and slight tendinitis in my left hand, and I have pretty small hands, so I have struggled to find a pen that I can write comfortably with for more than 10 minutes. These are it!!! Many pens are either too long, too thick/thin, or too heavy for me (like the Dr.Grip that many people have good luck with). These pens are just heavy enough, fit nicely in my hand without the "death grip" and these pens glide SUPER smooth for me. I definitely was not expecting such smooth writing with my first 0.38mm pen. With the grip being so comfortable and down close the tip, as well as Uni-ball's fabulous gel ink, I can take observations, notes, and do work without constant hand cramps. Can't wait for refills in the green and orange though! (I ended up purchasing the Uni-ball style fit slim3 for mandarin orange, brown black, and green in 0.38mm) ;)

Pleasantly surprised

This is a more recent try for me but I love them! They're fine, smooth and also good for drawing with, especially for the price, so despite being a gel pen I would recommend them as a good drawing pen alternative! I prefer the dark blue/black but have also tried various other colours available and find them just as good.