The OHTO C-310P rollerball refill features a silicon carbide (SiC) ceramic ball, delivering exceptionally smooth and consistent ink flow. The specially designed ceramic ball surface retains ink, ensuring effortless writing and uniform lines.

Thanks to OHTO\'s patented Non-Dry mechanism, the refill helps prevent the tip from drying out even when the pen is left uncapped. The ceramic ball also offers excellent resistance to wear and corrosion, ensuring reliable performance.