Steel Bike Freewheel, Mountain Bike Freewheel Cog, Freewheel Parts, Wear-Resistant for Mountain(10s 11T)Features: Made of high quality steel, high strength, non-deformation, wear-resistant and durable. Hollow out design reduces much weight to lessen the burden of long time cycling. Lightweight, easy to install and use. Provide fast and smooth ridin..