Pilot 77289 BG21RBLK G2 Refills 1.0mm Bold, Black Gel Ink, Pack of 2 Refills. The G2 gel ink glides across the paper without skipping or smudging, providing a premium writing feel. G2 bold refills are designed for use with Pilot G2, G2 Pro/LTD., G6, Dr. Grip Gel/LTD., Q7, BeGreen Precise Gel, GKnock and B2P. Dynamic gel ink formula delivers smooth, smear-proof writing.