OMG, I went thru Alpinestars, Oxford, Dainese pucks, they last nothing- gone in one day. But these sliders from woodcraft, its a joke how long they last. I have them for 3 Rounds of races and at least 10 trackdays and they are still there with more than half of life to go! Serously? what are they made off it doesnt wear off. I wished i found about these before, would have saved me so much cash in sliders! These are the BEST sliders EVER made. Congrats to Woodcraft.