4D number plates use characters cut from black acrylic and bonded to the plate, so they stand proud of the surface. They are the sharpest-looking option we make, and they are road legal as long as the plate is built to the correct standard.
What 4D actually means
The "4D" is marketing, not a DVLA category. It describes laser-cut characters with a physical depth and a crisp edge, rather than printed or domed characters. The material is usually 3 mm acrylic, cut to the exact shape of each character and fixed to a reflective blank.
3D gel, 4D acrylic and 4D gel
| Finish | How it is made | Look |
|---|---|---|
| 3D Gel | Raised characters under a domed resin layer | Glossy, rounded, factory-plus |
| 4D Acrylic | Laser-cut 3 mm acrylic, no gel | Sharp, flat-topped, solid black |
| 4D Gel | Laser-cut acrylic with gel over the top | Sharp edges with a deep gloss |
Are 4D plates road legal?
Yes, when they meet BS AU 145e and the display rules. The characters must use the legal font at 79 mm high (64 mm on motorcycles), in solid black, with the correct stroke width, spacing and margins. The plate must be reflective, white on the front and yellow on the rear, and carry the supplier name, postcode and BS AU 145e.
What makes a 4D plate illegal is not the acrylic. It is altered spacing, italic or "styled" characters, a tinted or coloured character, or fixings that change how a character reads. We only cut the legal shapes, so our 4D plates pass an MOT and a roadside check.
Durability and cleaning
Acrylic characters are bonded, not printed, so they do not fade like ink and they handle jet washes. Use a soft cloth and normal car shampoo. Avoid a scraper or abrasive polish on the character edges.
Ordering 4D plates
Open the plate builder, enter your reg and choose 4D Acrylic or 4D Gel. You can add a flag badge and pick the size before you check out. Compare sizes in the number plate size guide, or read the full road legal rules.
Published 24 October 2026