TheSram PG-1050 10 Speed Cassette.The new PowerGlide™ 1050 cassette offers an innovative approach to 10-Speed cassette design. SRAM's cassette performance is optimized by material choice, tooth profile and shift ramp design for quick and positive index shifting. The cassette shifts efficiently and positively in all high performance situations. SRAM's new cassette features a semi-spidered construction for a maximum stiffness to weight ratio and is available in many optimized configurations to best match a wide variety of uses. Sram PG-1050 10 Speed CassetteFeatures Technology: Power Glide Weight: 299 grams (11-32T) Gear Ratios: 11-32, 11-28, 11-26, 11-23, 12-36T Speeds: 10 Recommended Chain: PC-1090R, PC-1090, PC-1070, PC-1050, PC-1030 Lock Ring Material: Steel / Pad printed finish Sprocket Material: Heat treated steel / Blast Silver