SOLID DURABLE Tough yet lightweight the Zippa AM features a fully CNCd AL6061 backplate a highsecurity top guide and bottom roller and top quality hardware Ideal Chain Retention Keep your chain running smoothly on the chain ring no matter how rowdy things get Tooth Capacity Compatible with 32T to 38T single 1X chainring Mounting Standard Fits with ISCG05 or BB via external BB adapter EASY TO USE Its simple to install and all parts are fully replaceable It weighs only 120g but tough enough to ensure the ultimate protection when riding