The refill has a rounded nib designed to reduce friction with the writing surface. It is compatible with Uni-ball Signo UM-151 0.38 mm Gel Pen.
The refill has a rounded nib designed to reduce friction with the writing surface. It is compatible with Uni-ball Signo UM-151 0.38 mm Gel Pen.
in 3 offers
The lowest price for Uni-Ball Signo UMR-1 Gel Pen Refill - 0.38 mm - Blue Black right now is $1.99 at Stationery Pal, compared across 3 retailers.
The all-time low was $1.99 on 7 May 2026. That's the lowest price we've ever tracked — a great time to buy.
Prices last updated 12 May 2026.
Uni-Ball Signo UMR-1 Gel Pen Refill - 0.38 mm - Blue Black
The refill has a rounded nib designed to reduce friction with the writing surface. It is compatible with Uni-ball Signo UM-151 0.38 mm Gel Pen.
The refill has a rounded nib designed to reduce friction with the writing surface. It is compatible with Uni-ball Signo UM-151 0.38 mm Gel Pen.
Last updated at 12/05/2026 15:25:59
Uni-ball Signo UMR-1 Gel Pen Refill - 0.38 mm - Blue Black
60-day returns
Uni-ball Signo UMR-1 Gel Pen Refill - 0.38 mm, Blue Black
Delivery between 19–27 May $6.85
Uni-ball Signo UMR-1 Gel Pen Refill - 0.38 mm Blue Black
Delivery $28.12
originally posted on JetPens
I have used this refill several times and each time the pen stops writing after no more than 20 times writing. I have tried many different methods to get the ink flowing again and nothing has worked. It is a total waste of a refill and was hoping that after several times the refills will work. I am trying other UNI refills and hope they will work (0.5 and 1.0) but don't really have much faith these will work either. The UNI Style Fit refills on the other hand are amazing and I've had no issues at all with these.
originally posted on JetPens
I love being able to add refills. Especially the large selection of colors. I have been ordering these for several years.
originally posted on JetPens
Perfect fit for the Muji .38 pen body, once you shave off the little bits of plastic around the tip (super easy to do with scissors)!
| Diameter - Max | 5.2 mm |
| Ink Color | Dark Blue (Blue Black) |
| Ink Composition | Pigment-Based |
| Quantity in Pack | 1 |
| Size - Length | 11.8 cm / 4.6 inches |
Uni-ball Signo UMR-1 Gel Pen Refill - 0.38 mm - Blue Black
60-day returns
Uni-ball Signo UMR-1 Gel Pen Refill - 0.38 mm, Blue Black
Delivery between 19–27 May $6.85
Uni-ball Signo UMR-1 Gel Pen Refill - 0.38 mm Blue Black
Delivery $28.12
I have used this refill several times and each time the pen stops writing after no more than 20 times writing. I have tried many different methods to get the ink flowing again and nothing has worked. It is a total waste of a refill and was hoping that after several times the refills will work. I am trying other UNI refills and hope they will work (0.5 and 1.0) but don't really have much faith these will work either. The UNI Style Fit refills on the other hand are amazing and I've had no issues at all with these.
I love being able to add refills. Especially the large selection of colors. I have been ordering these for several years.
Perfect fit for the Muji .38 pen body, once you shave off the little bits of plastic around the tip (super easy to do with scissors)!
Love my Signo pen, and I'm so glad that JetPens has these refills. Timely delivery, and I'll definitely be purchasing more in the future.
My favorite pen and pen refill. I love the feel of these pens on paper and for me they're perfect for quick sketches and note taking. I like to keep a light touch, so these pens are great for solid lines with barely any pressure. They do smear if you run your hand over them if you don't let it dry, but it doesn't take too long for the ink to dry.
I first found out about the Uni-ball Signo UMR-1 gel pen through JetPens' pen sampler. It's now the primary pen I use for note-taking. These refills came quickly and worked well with the existing pens I have. No ink issues at all.
Also love the pens and especially nice that refills are also sold. Good service from Jetpens. Thank you.
Oh my goodness. How happy am I to find an authentic refill for the uni-ball signo gel pens. They are my absolute favorite for note taking and every day use. I couldn't find them before so I kept repurchasing the same pen, which isn't very cheap! The ink is very smooth and they fit perfectly into the Uni-ball Signo DX 0.38 mm gel pens. I went ahead and purchased 7 of these and they shipped to my place in just 2 business days! I will continue to repurchase these from this site in the future.
Very good product. Leaves a fine blue line , in its wake. However, when dropped on its tip, it will not write.
I was using this pens for years but when i couldn't find them in my local stores decided to order from ebay. And got luck these product is original as described, writes smooth and very fine. Quality as mentioned 100% made in japan. Shipping was fast.
| Diameter - Max | 5.2 mm |
| Ink Color | Dark Blue (Blue Black) |
| Ink Composition | Pigment-Based |
| Quantity in Pack | 1 |
| Size - Length | 11.8 cm / 4.6 inches |
