The CeramicSpeed Oversized Pulley Wheel System provides optimization and increased efficiency of the rear derailleur through its extremely low-friction bearings and unique overall design. FEATURES: Features two oversized 17-tooth aluminum pulley wheels with Grade 3 Silicon Nitride balls Robust cage crafted from polyamide and carbon fiber for durability and light weight Hardened steel bearing races Only compatible with SRAM 11-speed eTap derailleurs (fits up to 32t cassettes) Not compatible with 12-speed eTap AXS SPECS: Largest Cog: 32 Fits Brand: SRAM Fits Model: eTap/eTap WiFli Drivetrain Speeds: 11 Defined Color: Black