Premium material: 7075 CNC aluminium alloy, ultra-light and robust, durable and long service life. Suitable for: Support range, round disc 30-40T tooth plate, oval disc 30-38T. Lightweight: The weight of the chain guide is very light, stable and does not fall off. Easy to use: Convenient to install, can be installed without disassembly of the crankset, simple and elegant appearance. Good performance: The chain guide is a good accessory that ensures that the chain does not fall off and extends the life of the chain.