Features1Applicable Model: 38T 104 BCD electric bike chainring and adapter is compatible for Tongsheng electric bike mid drive motor. 2Aluminum Alloy Material: The material is aluminum alloy, the hardness is much higher than the original steel sprocket, sturdy and durable. 3Aluminum Alloy CNC Cutting: Using aluminum alloy CNC cutting to ensure product use accuracy. Exquisite workmanship, beautiful appearance. 4Improve Performance: The 104 BCD electric bike chainring and adapter can effectively improve the performance of electric bike. 5Closely Fitting: Closely fit the original machine hole position with accurate shape and size design, hand feelings are still comfortable.SpecificationItem Type: 104 BCD Electric Bike Chainring and AdapterMaterial: Aluminum AlloyBCD: 104MMWeight: Approx. 220g / 7.8ozPackage List1 x 104BCDChainRingConversionKit