Material:Aluminum/Alloy Use:Road Bicycles Use:Mountain Bikes Use:Cruisers Use:BMX Use:Kids Bikes Pedal Device Category:Bearing Pedal Category:Ultralight Pedal Model Number:PD-M72 Size:about 122*64*22mm specification: 1. Weight: 295g / group 2. Body: aluminum alloy 3. Axis: chrome molybdenum steel 4. Bearing: self-lubricating bearing + sealed type 1 Palin 5. Height of the foot support: about 7cm (foot to the ground height) Instructions for use: The part of the arm is unfolded, and then the foot is fixed after the ground is fixed. When the foot is closed, the foot support is automatically closed. The foot support will automatically merge with the pedal due to the action of the magnet. No other unnecessary operation, simple and practical .