These are 30 sure foam donuts, they can be used on 1/8 scale on road cars or 10 scale off-road buggy's and trucks, with 2.2 rims,these will make a front and rear set a phone donuts for a buggy, they're only big enough to make a front or rear set for a 1/10 truck, I make these tires for people at a local track one track is carpet the other is more of a rubber track and they work very well, some people also use these out on Concrete or ashfault , if you would like me to make you a set please contact me and we can work out the details , thanks mike