From the Motorsport in Detail website:
This display base cover is designed and printed on professional stock (clear film), and is very accurate to the design as described in the title and shown here. It is designed to be cut and trimmed to the size required, and can easily be glued onto the base of your choice, such as wood, plastic, foamboard etc. It can also be trimmed to fit a picture frame, which you could also use as your base template.
The usable base section of this sheet measures 264mm x 165mm.