brand new and high quality Features: Three-layer electroplating anti-rust, exquisite wear-resistant Fine quenching-temper hardening technology. Harder and more wear-resistant, longer life. High-precision positioning tooth profile, efficient transmission. Suitable for road bikes and mountain bikes. Perfect to replace old freewheel, work perfectly for optimum performance and maximum safety and longevity. Bike Flywheel only, other accessories demo in the picture is not included! Specifications: Material: Steel Plating 6/7 Speeds Diameter: app.11.4cm/4.49in, Thickness: app.3.3cm/1.30in 8 Speeds Diameter: app.11.4cm/4.49in, Thickness: app.4cm/1.57in 9/10 Speeds Diameter: app.13cm/5.12in, Thickness: app.4cm/1.57in Speed: 6 Speed, Number of Teeth: 14-16-18-21-24-28T Speed: 7 Spped, Number of Teeth: 14-28T Speed: 8 Spped, Number of Teeth: 13-14-15-17-19-21-24-28T Speed: 9 Spped, Number of Teeth: 13-14-15-17-19-21-24-28-32T Speed: 10 Spped, Number of Teeth: 11-13-15-17-19-21-24-28-32-36T Optional Color: Brown, Silver Optional Speed: 6 Speed, 7 Speed, 8 Speed, 9 Speed, 10 Speed Quantity: 1 Pc Note: No retail package. Please allow 0-1cm error due to manual measurement. pls make sure you do not mind before you bid. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you! Package Includes: 1 x Bike Flywheel