New patented external ring seal paired with an internal sleeve seal protects bearings from water and contaminantsProvides extremely efficient and smooth function as well as long lasting reliabilityMates with the external stainless steel bearings which are attached to the crank arms as an integral unit rather than the BB cups for greater size and easier maintenance accessAvailable in multiple threaded and pressfit optionsBearings sold separately (#19160)Compatible with Campy EKAR Pro-Tech cranks only77mmT47AProTechAlloyUPC/EAN/GTIN: 8055136023609