These rubber bottoms are custom made in house. They have a durometer rating of 65, which is the same texture and density of a car tire. They have great grip ability and are very durable. There is 5/8” of rubber on the bottom, the inside dimension is 1 1/4” and will stretch. Using a water based lubricant and/or heat gun to get them on a tight fit is also an option. We get them on our wood stilts by shaping the bottom of the stilt to be more round and bulbous. The stilt bottoms you use with these feet need to have a cap on them and not an open raw tube that will cut thru the rubber. If you are having issues give us a call! Currently they are not available as a wholesale product.