This radial bearing features 440C stainless steel alloy races and Grade 10 balls with dual-lip, labyrinth (LLB) seals and 90% fill with Kluber NBU52 ultra-smooth and sticky, water-proof grease to withstand daily abuse of use and the elements.A radial bearing is used as freehub bearing, particularly by Mavic.Not all stainless steel is created equal. Enduro only uses 440C stainless steel balls and races to provide long life and superior corrosion resistance in applications and environments that may be less than ideal.