SlapItUp™ Industrial Alphabet, Numbers and Symbols are statically charged polypropylene that is repositionable, rechargeable, and recyclable. This amazing product sticks to any indoor, dry, clean surface once you've peeled the backer off slowly. If the static charged is lost simply recharge the product by placing it on a TV screen while the TV is on or rub with a wool cloth. Includes 183 blue numbers, symbols and letters. Perfect for businesses, store windows, classrooms, homeschooling, the office, children's bedrooms and more!