Uni-ball Signo Dx 0.28 Um-151 Gel Ink Pen 10 Pcs (Black) The Uni Signo DX (UM-151) is claimed by some to be even better than the Pilot Hi-Tec-C! It comes in 0.28mm tip size. The barrel and tip are a bit sturdier than the Hi-Tec-C, which might explain why converts love them