Brand: wellgo Model: WPD-M17C Use the model: mountain bike Body material: aluminum alloy Axle material: chrome molybdenum steel Bearing: self-lubricating bearings + sealed Pei Lin Size: 100.8 * 65.2 * 27.2 Weight: 380g / group Packing: genuine boxed Origin: Taiwan Features: 1. A wide tread, a self-locking device 2 tread is more generous, but also grasp the foot. Self-locking device, riding stable, increasing pedaling efficiency 3. Sealed bearings, durable, anti-dust dust 4. Non-slip surface of the tooth, effective non-slip, but also grasp the foot