SlapItUp™ Educational 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 it with a wool cloth. Includes 276 multicolored numbers, symbols and letters in both upper and lower case. Perfect for classrooms, homeschooling, the office, children's bedrooms and more!