Features: Our bike chain Retainers is suitable for both internal cable routing and standard cable routing, enduring and resistant to wear and tear. Make of nylons materials, middle of this chain Fixer is make of elastics materials, which antibreak, stable in performances. The chain drop catcher limit chain chatters caused by swinging arm under hard bump. This bike chain Retainers can adapt to the bike frame with tube, suitable for any bike with traditional chain. (not suitable for high designs) Easy to install. The rubber pivots have a cushioning effect, making cycling quieter. Specifications: Materials: Nylons Size: about 6.5x3cm/2.56x1.18inch Package Includes: 1Pc Bicycles Chain Retainers Guide note: Please allow 1-2cm errors due to manual measurement, make surely that you not mind before order. Due to difference between different monitors, the picture may not reflect the actual color.