The braking system installed on your DJ ebike is TEKTRO MD-M280. The ideal pads in the TEKTRO family of products are A10.11. You can also get away with using P20.11, E10.11, and A10YS. For those in wet conditions, ceramic, and for those that would be riding in high temperature we suggest metallic based on testing.
Disc specs: 160mm, with 6 bolt rotors