Stolen Rampage Rear Hub Guard – Freecoaster/Cassette Black Complete Assembly. Stolens Rampage hub guards utilize the proven Thermalite material thats molded into a guard and pressed on to a CNC machined core. Thermalite is long lasting Nylon66 based material that is perfect for sliding and surviving high impacts. Made to fit and protect the Rampage front and rear hubs (and they fit a bunch of other hubs too).