Basis are cups and a central sleeve made from CNC machined aluminum. O-rings between the central sleeve and the bearing shells prevent water and dirt can get over the frame inside the inner bearing. In the bearing shells rotate stainless steel ball bearings, which by Warehouse specialist INA are manufactured for Hope in Switzerland. The ball bearings are double sealed and protected by a labyrinth seal.
Compatible with all PF30 or BB30 cranks !