OKBY 8 Speed 46T Large Gear Mountain Bike Ultralight Hollow Cassette Freewheel Bicycle Freewheel Bike Freewheel Cassette Bicycle AccessoryFeature: 1. The gear adopts hollow out design, which reduces weight and is easy to install and use. 2. Freewheel is made of high strength steel, adopts hardening technology, with greater resistance, durability an..