CASSETTE SPROCKET, CS-R9100, DURA-ACE, 11-SPEED, 11-12-13-14-15-17-19-21-23-25-28, IND.PACK

Using a carbon fiber and alloy spider and five titanium sprockets, the DURA-ACE R9100 cassette provides accurate shifting and light weight to the most discerning road cyclists on the planet