3x10x4 The single most common size bearing in all baitcasting fishing reels.
SS Ceramic- Our original ABEC5 Ceramic that has been in service for many years
XS Ceramic- Stainless Steel sealed ABEC7 Ceramic with ribbon retainers and S20 Ceramic balls
XP Ceramic- Open Hi-Performance ABEC9 Ceramic with Japanese ribbon retainers and S25 Ceramic balls
XCR Ultra- The highest level Performance Bearings available in a fishing reel. ABEC9 With S30 Ceramic balls and PEEK Polyether Ether Ketone ribbon cage/retainer