neon4dRed Neon 4D Number Plate. Product Style: X1 – 3mm 4D Ruby4D Laser cut: This is the first layer of the product, 3mm thick, 4D Ruby for a depth effect.Road Legal & DVLA-Compliant – All 4d reg plates meet UK legal requirements.; Hh-Quality Materials – Made from retroreflective Perspex acrylic for maximum clarity and visibility.;