10T. Composite material from EMS Swiss with a 40% fiberglass blend. Special tooth profile designed for quick shifting performance. Includes compatible sleeves for various shifting systems. Suitable for Shimano 7- and 8-speed; Campagnolo 8-, 9-, and 10-speed; SRAM 9.0 ('97/'98), 9.0SL ('98), 7.0 ('97/'98), and 5.0 ('98/'99).