The braking system installed on your DJ ebike is likely 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 DJ e-bikes equipped with the Nutt brake system, the pads are NUTT S-5 brake pads. 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