HumperBumper.com FOUR PACK BUMPER STICKERS: Police Public Call Box. Dr. Who: (One For Each Side Of Your TARDIS) - VINYL 2.75" X 10" VINYL BUMPER STICKER: Professionally printed, top quality material. Made in the USA UV and water resistant vinyl material Will not fade, crack or peel Will last for years, but will peel off when you need it to without tearing to shreds.