This is the ideal cassette for people who want a lighter and as durable cassette than Shimano XTR and PG-990. It is so light because all cogs are in Titanium except the 11 cog which is in steel. The spider, spacers and lockring are in aluminium.Christoph Sauser won the 2008 MTB World Championship with this cassette!- Color: Silver or Gold- 11-32 (11-12-14-16-18-21-24-28-32)- Weight: 175gFor information:- XTR CS-M970: 11-32: 225g- XTR CS-M960: 11-32: 242g- XT CS-M760: 11-32: 263g- SRAM PG-990: 11-32: 271g- SRAM PG-980: 11-32: 273g