Dry Erase Shapes are perfect for single or group classroom use for math, writing, word practice, games, and more! Features a high-quality dry erase surface, a thick durable foam inner layer for tear-resistance, and a unique tacky backing that make them repositionable and reusable hundreds of times. They stick to almost any clean, dry surface. When they get dirty, just wash them off with water, and they will stick just like new!