For those of you who are stuck for a hubguard solution or are running a looseball rear hub, we came up with the Servo Universal hubguard. CNC machined out of super tough Chromoly, the Servo is only 1.8mm thick and slides on over the top of the existing hardware and protects your hub from damage. Note: This universal design will fit the majority of hubs on the market, but there may be some exceptions. To be 100% sure on compatibility, clat recommends customers consult their local bike shop or mailorder before purchase. Material: 4140 Chromoly. Features: universal design, fits over exisitng hardware on most hubs. Weight: 96g / 3.4oz.