For use with Ultra-Torque chain sets, where the axle Joins in the middle of the chain set. careful studies Conducted by the campy Tech lab engineers allowed material to be removed In zones that could be lightened but at The same time points of stress were strengthened. to make the bottom bracket more Efficient the axle has varying thicknesses, obtaining an incredibly light axle while offering absolute rigidity. maintaining the lateral measurements already Defined guarantees maximum compatibility. super record cups are only for use with super record chain set. campagnolo Original replacement part light weight construction bearings Not included. in the box 2 x Ultra-Torque cups lh crush washer rh circlip warranty information user manual cpb001: oc12-rei cpb002: oc12-reg cpb003: oc12-sri cpb004: oc12-srg cpb005c: ic15-re41 cpb006c: ic15-re42 cpb014c: ic15-re46 cpb015c: ic15-utr51e cpb017c: ic15-ut386 cpb018: ic19-ut73.