Ceramic Speed OSPW Standard Non Coated System for SRAM ETAP Black Entirely developed, designed and produced in Denmark by CeramicSpeed, the Oversized Pulley Wheel System for SRAM eTap is a technologic advance for the cycling industry. Matching the highest quality materials with a unique design, the OSPW System delivers lower friction and longer lifetime, improving your competitive advantage. Thanks to the OSPW System for SRAM eTap, the power savings start at 40%, and the CeramicSpeed Bearings inside guarantee a 3-5 times longer longevity compared to commonly used standard pulleys on the market. The watt savings with a CeramicSpeed OSPW System for SRAM eTap start at 1.6 watts. The OSPW system for SRAM eTap derailluers is compatible up to a 32 tooth cassette size. The OSPW system for SRAM eTap derailluers is compatible with both short cage amp; WiFli derailluer bodies IN THE BOX - Oversized Pulley Wheel System - Oil