Positive and negative tooth design makes the chain fit with the tooth shape to prevent drop chain. CNC machining design ensures high strength and high hardness. Electroplating and anodizing process design makes it lightweight and rust resistant. It is constructed of aluminum alloy material. Hollow design makes it prevents built-up for easy cleaning. It is suitable for bike. Item Name: Bike Chainring Material: Aluminum Alloy Tooth: 40T/42T/44T/46T/48T/50T/52T Features: High Strength, Good Toughness, Wear Resistant Size Details: Size: 104BCD Notes: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Package Includes: 1 x Bike Chainring