3 years & up. These sponge sheets are great quality, highly resilient craft sponges that can be cut into any shape or object. After cutting a shape, just dip in water and watch the sponge expand. Craft sponges can be used for sponge painting on walls, making borders, designing t-shirts and more. Sponge crafts are fun to do in addition to providing an excellent tactile tool for kids to play with. Sponge sheets measure 3" x 4" and come 4 to a pack.