Superior Filled with Dynamic Gel Ink Formula that's smooth writing and smear-proof The ink is water-resistant, acid-free, and archival safe G2 writes longer than the average of the top branded gel ink pens Features a nice contoured grip to keep you comfortable for all those long writing hours. Refillable Using Refill BLS-G2         Ideal for everyday home or office use 0.5mm tip WITH BLACK REFILL 1 PILOT G2-0.5 BLACK PEN + 1 PILOT G2-0.5 BLACK REFILL