CeramicSpeed Oversized Pulley Wheel System Shimano 10- and 11-Speed, Alloy Pulleys and Carbon Cage Black

Oversized 17t pully wheels and high performance ceramic bearings achieve lower friction in your drive train

High quality bearings have 3-5 times greater longevity than conventional bearings
Aluminum Pulley Assembly / Carbon Cage
17-tooth aluminum pulley wheels
Handmade in Denmark
Non-coated bearings
Shimano 10-11 speed OSPWS is not compatible with Dura Ace 9100