Dear friend, welcome to MENGXUAN. Our store has a wide range of products, please feel free to choose. Wishing you a pleasant shopping experience! Material: 7075 aluminum alloy CNC & Nylon Spec: BB mount / ISCG03 / ISCG05 (optional) Color: Black / Red (optional) Range: 32-40T round chainring, 32T-38T oval chainring Weight: BB mount about 30g, ISCG03/ISCG05 about 26g Package include:1xBike Chain guide This chain guide is a great accessory that ensures the chain will never drop and prolong the life of chainring. Suit for 32-40T round chainring, 32T-38T oval chainring. Never drop a chain again and double your chain ring life. CNC 7075 aluminum alloy, super light and strong. Easy to install. Bike Chain guide Single Speed BB mount Aluminum Alloy Single Ring ISCG03 ISCG05 CNC MTB Mountain Road Bike Bicycle Part. I'm glad you ordered from our store. If you're satisfied, please give us a timely review. If you have any questions, please contact us promptly. Working hours: Monday to Sunday (9:00-18:00)