Feature:1. Premium Material: Made of premium aluminum alloy, the 104BCD electric bike chainring and adapter is sturdy and durable, its hardness is higher than those made of crude steel.2. Applicable Models: The 38T chainring conversion kit is suitable for Bafang electric bike mid drive motor BBS01, BBS02, you can use it for corresponding motor.3. CNC Cutting: Adopted of aluminum alloy CNC cutting, the electric bike central drive motor boasts high accuracy, durable and sturdy when in use.4. Lightweight: The 104BCD chainring adapter is light in weight, time and labor saving for you to replace the old or damaged parts.5. Scratch Resistant: The 38T gear adapter chainring can prevent your electric bike central drive motor from scratches, so that to prolong its service life.Specification:Item Type: 104BCD Electric Bike Chainring and AdapterMaterial: Aluminum AlloyWeight: 170g/6.00ozBCD: Approx. 104mm/4.09inSuitable: For 7,8,9,10,11,12 Speeds.Package List:1 x 104BCD Electric Bike Chainring and Adapter