Features 1、Aluminium alloy material is lightweight but high strength 2、Compatible with bike crank whose BCD is 104mm 3、Ergonomic oval shape utilizes the stampede acting efficiently to create more stampede traction, reduce the load and fatigue of the leg and knee and ensure smooth cycling 4、Unique teeth design increases the contact area with chain, which can enhance the grasp force and reduce the chain drop to allow you to pass through the bumpy road easily 5、Proper thickness ensures no flexing Specification Features: Aluminium alloy material is lightweight but high strength. Compatible with bike crank whose BCD is 104mm. Ergonomic oval shape utilizes the stampede acting efficiently to create more stampede traction, reduce the load and fatigue of the leg and knee and ensure smooth cycling. Unique teeth design increases the contact area with chain, which can enhance the grasp force and reduce the chain drop to allow you to pass through the bumpy road easily. Proper thickness ensures no flexing. Specifications: Material: Aluminium Alloy Optional Teeth: 32T, 34T, 38T BCD: 104mm / 4.1inch Color: Black Shape: Oval Weight: 59g Type: Chainring Package Includes: 1 x Bicycle Chainring Package List