This 11 speed chainring is perfect for mountain bike riding, as it offers fantastic torque & excellent chain retention on your adventures. It features a rock-solid aluminium construction, which allows it to handle all the abuse that's associated with long days in the mountains. Engineered for use with FSA Powerbox chainsets, this model is equipped with a long tooth profile that enhances chain retention. This means you can shred the trails with complete confidence without worrying about chain slip. Coming complete with laser-etched FSA logo graphics, this model looks as awesome as it performs on every ride. Manufacturer's Part Number: 38T: 380-0312017051; 36T: 380-0249024051