The Uni-ball Signo DX UM-151 gel pen is best known as smooth flowing quality gel ink. It also features comfortable rubber grips making an ever smooth and pleasurable writing experience. It also has a secure clickable cap to prevent from ink leaking. Also, the transparent barrel makes it easier to see the ink level. The sturdy stainless-steel tip is extremely durable even for heavy users. In addition, the pigment-based gel ink is fade-resistant, feather-resistant as well as water-proof. The pen features a medium tip size of 0.7mm. All in all, it is one of favourite gel pens of all time and for everyone.