About Campagnolo Record 10-speed Cassette: "The further development of the 10-speed drivetrain this year that Campagnolo introduced last year spurred the creation of new sprockets. This year Campagnolo is introducing Ultra·Drive, sprockets with new profiling and machining. The new name communicates better, more accurately its superior feel. 11-23 (, 12-25, or 13-29 (13-29 cannot be used with short cage rear derailleur, triple or medium cage must be used.) 11-23 is the only size that comes with a lock ring. 12-25 & 13-29 do not have lock rings. We do not carry lock rings separately. Manufacturer listed weight: 188g.".