The 7075-T6 aviation aluminum alloy material makes the chainring both lightweight and high strength. It fits various types of bike crank with a 104mm BCD and is compatible with 9/10/11 speed chains. The precision machining and anodic oxidation electroplating ensures a smooth, bright, and corrosion-resistant surface. The narrow wide tooth design provides a stronger grip and reduces the possibility of chain dropping, suitable for navigating bumpy roads. Features: - Light weight but also high strength. - Fit for various kinds of bike crank which BCD is 104mm. - Precision machining and anodic oxidation electroplating, keep medals smooth surface, bright color, not faded and corrosion resistance. - The narrow wide tooth design increasing the contacting area with the chain greatly, so that each of the teeth can be fully inserted into the chain, increase the grasp force, make you no longer worried about the chain dorpped, easy to pass through the bumpy road. Specifications: Material: 7075-T6 aviation aluminum alloy Range: 32T, 34T, 36T, 38T Compatibility: 9/10/11 speed Size/BCD: 104BCD Package Included: 1 104 BCD Narrow Wide Chainring Notes: 1. Manual measuring, please allow 1 ~ 3mm error, thank you. 2. Due to the difference between different monitors, the picture may not reflect the actual color of the item. We guarantee the style is the same as shown in the picture.