5 x 3.5 inch plain flat oval. 3/8" uniform thickness with a soft rounded edge all the way around.
Additional Information
These will be used in place of the Toyota logos on my car, and will be attached to the vehicle using special adhesive double sided tape. In a perfect world they would be made using a satin (low sheen) black plastic. If it's another color or they're metal then I'll be painting them.