The Animal Bikes Pyn cassette hub guard protects the hub flange and spokes from grind damage by replacing the non-drive side hardware with a 7075 aluminum core and replaceable polycarbonate sleeve, which reduces drag for more predictable grinds. Designed to work with Animal Javelin hubs, but includes spacers to adapt to other 14mm male axle rear hubs such as the Cinema Tungsten, Eastern Birectional, Shadow Rant V2, Shadow Raptor V1, Odyssey Hazard V3 and others using the included washers. (2.2 oz)