A great replacement cassette for Shimano compatible 9-speed drive-trains. Lighter than Ultegra and much less expensive than Dura-Ace. 11-21 11-12-13-14-15-16-17-19-21 200g 11-23 11-12-13-14-15-17-19-21-23 210g 12-23 12-13-14-15-16-17-19-21-23 210g 12-26 12-13-14-15-17-19-21-23-26 230g 11-32 11-12-14-16-18-21-24-28-32 330g