DOBPLAST reflector 904003 red reflector 90 mm × 40 mm with holes The DOBPLAST 904003 reflector is a passive reflective safety and contour marking element in a rectangular design with dimensions of 90 mm × 40 mm for fixed mounting via holes on trailers, cars, vans and commercial vehicles. The red reflective surface provides improved visibility in road traffic, while the E20 IA homologation allows for use in accordance with standards.