Electric Bicycle Wheel Kit 1) Material: aluminium 2) Process: die casting 3) OEM ... Treatment, Packing.Surface treatmentHigh quality polishing, Chrome/nickek/Zinc(white, blue, yellow, black)plating, hot galvanized, painting, powder coating, Anodizing ... R&D teamPlentiful experience and skillful technique on die castingCertificationsISO9001:2008, TS16949 We will comform the spirit of "lasting improvement ...