Wacom Bamboo Stylus FEEL Replacement Nibs bundle: 5 Firm White & 5 Soft Black ACK20602/ACK20603 ONLY COMPATIBLE WITH BAMBOO "FEEL" STYLUS 5 pack Firm nibs for "Feel" Stylus Black & White These firm nibs have a stiffer feel like that of a ballpoint pen, but won't scratch the glass surface of your table For use with: CS300UK, CS300UW, CS400UK Pen Not Included. MODEL: ACK20602 & ACK20603