Pilot G2, Dr. Grip Gel/Ltd, ExecuGel G6, Q7 Rollerball Gel Ink Pen Refills, 0.5mm, Extra Fine Point, Black Ink, Pack of 12 G2 writes longer than the average of the top branded gel ink pens. Independent third party ISO testing. Average of G2 write out (all point sizes) compared to the average of the top branded gel ink pens tested (all point sizes). Data on file with Pilot Corporation of America. Fits G2, G2 Limited, G2 Pro, G6, Dr. Grip LTD., Dr. Grip Gel, Precise Gel BeGreen, G-Knock BeGreen, Q7, B2P Gel Ink pens, ExecuGel and Pilot MR Gel Roller Dynamic Gel Ink Formula that is smooth writing and smear-proof with a extra fine 0.5mm point 12 premium Black gel ink refills - Extend the life of your favorite Pilot Gel Ink Pen