Description: brand new and high quality Features: Exquisite workmanship, full CNC precision machining, anode color, bearing shaft, can be used with a variety of guide wheels, the guide wheel is generally 11 teeth, can also use 13 teeth. Floating pulley and spring adjust for perfect chain tension. Light weight and easy to install, made of high grade aluminum alloy material, durable in use. Specification: Type: Chain Tensioner Material: 6061 Aluminum alloy Applications: Single speed folding bicycle Features: Stable chain, exquisite workmanship, light weight, easy to install, high quality materials, durable, bicycle accessories Dimension: app.5.5x12cm/2.17x4.72in Color: Red, Black (optional) Quantity: 1 Pc Note: 1.Please allow 0-1cm error due to manual measurement. pls make sure you do not mind before you bid. 2.Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you Package includes: 1 Pc x Chain Tensioner