Comix Quick-Dry Retractable Gel Pen Refills ST Tip Stainless Steel Needle Tip 0.5mm Black 20-Pack R511

Precision steel cone tip enhances writing smoothness by 15% compared to ordinary bullet tips (data from COMIX laboratory).

Compatible with most retractable gel pens on the market, including COMIX models K3511, EB35, GP108, K5511, GP567, GP123, K35, S01, GP1008, and R511.

Ink quality ensures no leakage with 8-hour suspension leakage test passed, meeting Six Sigma standards for ink leakage control.

Smooth writing experience with reduced friction coefficient (0.16 vs 0.19 for ordinary bullet tips).

EF grade line length over 400 meters with consistent ink flow and no obvious breaks or fading within 100mm.

Reliable quality assurance from a trusted brand.

Ideal for general writing purposes requiring smooth, quick-drying ink and reliable performance in retractable gel pens.