The Animal Bikes Pyn Chromoly Rear 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 chromoly sleeve to increase durability. Designed to fit the Animal Javelin cassette, but will work with 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. (3.7 oz)