Uni-ball ONE P Gel Pen

By Uni Mitsubishi. 

These chunky rollerball pens have a 0.38mm black gel ink line. The ink is quick drying and fade resistant. 

They have a retractable nib, a metal clip, and come in a gorgeous range of barrel colours. 

They are 11.5cm long, and the grip is about 1.5cm wide. 

All pens have black ink. 

Refills available here, in blue or black ink, and with 0.38mm or 0.5mm nib width.