Features1Aluminum Alloy: Made of aluminum alloy material, which is much harder than the original steel chain wheel, strong and durable. 2Applicable Model: 104BCD 34T conversion base is ly compatible for Tongsheng electric bicycle mid drive motor. 3Aluminum Alloy CNC Cutting: 104 BCD 34T chainring adopts aluminum alloy CNC cutting to ensure the accuracy of product use. 4Scope of Application: 104 BCD 34T chainring fits 7, 8, 9, 10, 11 speeds chainring, can effectively improve the performance of your bike. 5Good Performance: Exquisite workmanship, beautiful appearance, stable and reliable performance, providing you great using experience.SpecificationItem Type:104BCD Sprocket AdapterMaterial: Aluminum AlloyBCD: 104MMWeight: Approx. 188g / 6.6ozApplication: Fit 7, 8, 9, 10, 11 SpeedsPackage List1 x 104BCD Sprocket Adapter