The best bumper is made of stainless steel SAE 304, DIN 1.4301, UNS S30400 , 18-20% pure chrome content, thickness 1.5- 2mm.
Back side of bumper is covered by 3 painted coats to protect bumper from chemicals, weather elements. And these paint coats will make back side more smoothly, and wonderfully. The gloss of bumper is shiny like mirror polish, even better than chrome bumper.
These bumpers will be never rusty. And the bumpers are duplicated from original sample bumper for fitting, shape, dimension etc
It is ok to contact this poster with commercial interests.