Hand-built in Denmark for quality assurance, the CeramicSpeed Campagnolo 11S Pulley Wheels are the finest on the market. With guaranteed reduced frictional drag and increased bearing life, Campagnolo 11-speed rear derailleurs will love the CeramicSpeed treatment. Thanks to the reduced drag more power is transmitted to the rear wheel. The machined aluminium pulleys paired with CeramicSpeed Balls installed on hardened-steel races test better than any on the market. They are compatible with all 11-speed Campagnolo derailleurs, mechanical and electronic. With a lifespan that is 3-5 times longer than other Pulley Wheels on the market, your bike is ensured the best to beat the rest.