Window stickers are all in white vinyl. They can be placed on the outside of you car window, or anywhere else you can think of putting a sticker (Water flask, Laptop, Ipad, etc.)
Size is noted in menu after the number. All sizes are approximent
Stickers - Page One
Make sure surface is clean with glass cleaner, rubbing alcohol or similar. Remove paper backing and apply to surface using a credit card, or somthing simalar. Remove top layer and you are good to go.