Disc is made of good quality material, durable to use.CNC machining integrated, intensity is more secure, apply for long time cycling.The narrow wide tooth design make you no longer worried about the chain dropped, easy to pass through the bumpy road.Type: Bike ChainringMaterial: Aluminum AlloyApplicable Crank: 104BCDNumber Of Teeth: 34TBCD: 104mm/4.09"Features: Durable, Stable, Easy to UseRound: Outer Diameter: 144mm/5.67", Screw Hole Distance: 73mm/2.87" (Approx.)Oval: Outer Diameter: 137mm/5.39", Screw Hole Distance: 75mm/2.95" (Approx.)Notes:The sprocket BCD is 104, and the purchaser carefully determines that his crank is 104BCD (the diameter of the circle formed by the center points of the four disc nail holes is 104 mm), don& 39;t make a mistake, or it will fail to install.Due to the light and screen setting difference, the item& 39;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 (Not Including Screws)