Durable vinyl numbers helps you satisfy requirements for marking USDOT numbers on motor vehicles. ^^ Use these 3-1/2" numbers on blank placards, sqaure-on-point markings or motor vehicles to comply with DOT hazmat ID number marking requirements. ^^ Convenient to use for indoor or outdoor applications. Each sticker measures 4" x 2-1/8" ^^ Placard numbers are printed in black ink on clear vinyl with permanent adhesive backing. ^^ Each kit contains a total of 500 numbers: 10 packages of 50 pressure-sensitive number decals (numbers 0 through 9).