Make of Aluminum alloy materials is Enduring and practical for long terms use. Light weight, not easy to corrode and deforms, with strong stability and durability. Designs for M510/M600/M620/420/M615/M820 electric bicycles and fit perfectly with your bicycles part. With elegant black colour, this chainring crankset adds styles to your electric bike. With 42T, it ensures perfect power transmission for efficient cycling.