Grab your kids attention with these colorful alphabet mats. Interlocking pieces are 4" x 4" , all mats together cover 7 square feet. Pieces also interlock in 3-D format. They are made of a 1/3 inch of foam-like materials. Children spell words or use their imagination to create houses, toy boxes, castles,etc. A must for pre-school and kindergarten classrooms. Comes in attractive plastic tote bag for easy storage.