Features: Bike narrow wide chainring is made of aluminum alloy, designed with positive and negative teeth to prevent the chain from falling, strong force. Safe efficient design: Machining integrated, intensity is safe, suitable for long time cycling. Extended support pluses or minuses tooth shape, the chain can work better. Size/BCD: 110/130; Splines: 36T 38T 40T 42T 44T 46T 48T 50T 52T 54T 56T 58T 60T. The thicknesses of teeth are processed, which can work seamlessly with the inner and outer link of the chain to fit your cycling, reducing friction and noise. Bike chainring is suitable for most 110/130BCD cranks; please make sure your crank BCD and number of teeth specification carefully before purchasing. Specifications: Material: Aluminum Alloy Color: As shown in pictures Package Weight: approx. 110g Size: approx. 30cm / 11.81in Package Includes: 1 Pc Bike Chainring Note: Please allow 1-2cm error due to manual measurement. Please ensure you do not mind before ordering. Due to differences between monitors, the picture may not reflect the actual color of the item. Thanks!