This 440C stainless steel material provides maximum corrosion resistance bearings. Stainless steel is a good alternative in constant wet conditions, or where sweat becomes a problem such as headset bearings. Enduro Bearings uses LLB type seals and CRC Marine Grease in these bearings to additionally water proof against the elements. - 440C stainless steel balls and races SPECIFICATIONS - Thickness: 7mm - Material: Steel - Bearing O.D. (mm): 42 - Manufacturer Number: 6806 - Bearing I.D. (mm): 30