Features： 1、BIKE CHAIN STABILIZER: Prevent chain derailment and enhance riding safety with this quick and easy to install device designed for self folding small bikes with a frame chainstay distance of 21 to 23mm. 2、ROBUST MATERIAL: Crafted from excellent quality POM, this bike chain stabilizer is robust, water resistant, and effectively protects the chain from dirt and damage. 3、PRECISE DESIGN: The compact and well crafted design ensures a great fit for folding bikes, providing enhanced stability and reducing chain loosening and vibrations. 4、ENHANCED STABILITY: Increase the stability of the chain on the sprocket, reducing the chain skipping or dropping, and prolonging the overall lifespan of the chain. 5、PORTABLE AND LIGHTWEIGHT: Compact and lightweight for easy transportation and storage, this chain stabilizer is convenient for daily riding needs and on the go use. Specification： Item Type: Chain Stabilizer Material: POM Purpose: Stabilize the chain on the chainring, prevent chain skipping or dropping Application: for self folding small bikes, other models check sizes, requires 21-23mm distance between frame tube and chain, not suitable if too large or too small Package List： 1 x Bike Chain Stabilizer