I wanted to check , and re pack the bearings on the 5th wheel camper I bought this spring. Ordered 4 axle seals from my local advance auto parts, and was surprised that when I opened them, the sealing surface is made from a felt like substance. It seems pretty firm. Hope it does not spit grease everywhere. I've been at this a long time, and cannot remember ever seeing an axle seal made like this before.