Enduro's entry level BB solution, though many steps up when compared to other products on the market, we couple our ABEC-3 radial bearings with precision machined Delrin cups that simply press directly into the BB shell. Enduro ABEC-3 bearings feature 52100 High-Carbon Chromium alloy races paired with grade 10 Balls, LLB seals and 90% fill high-pressure, water-proof grease. Enduro engineers all of our radial bearings with deeper grooves to accommodate the largest balls possible, providing maximum bearing contact area and greatly increased bearing life