with high qualityMaterial: 7075 aluminum alloy & NylonSpec: BB mount / ISCG03 / ISCG05 (optional)Color: Black / Red (optional)Range: 32-40T round chainring, 32T-38T oval chainringWeight: BB mount about 30g, ISCG03/ISCG05 about 26gQuantity:1pcDescrtion:This chain guide is a great acceory that ensures the chain will never drop and pro the life of chainring.Features:Suit for 32-40T round chainring, 32T-38T oval chainring.Never drop a chain again and double your chain ring life. 7075 aluminum alloy, super light and strong.Extremely easy to install.Package Included:1pc Chain GuideNotice:1.1cm=10mm=0.39inch.2.Please allow 1-2mm error due to manual measurement and e sure you do not mind before ordering.3.Please understand that colors may exist chromatic aberration as the different pment of tures.