Pilot G2 10 Purple 31648 G21-PPL-BC, 1.0mm Bold Point, Purple Gel Ink Retractable Rollerball Pen. Pilot G2 retractable pen contains water resistant, smearproof blue gel ink that offers exceedingly smooth writing. Retractable design means no cap to lose. Contoured, latex free rubber grip provides writing comfort. Refillable with Pilot refill P1A77363.