Grab your kids' attention with these colorful alphabet mats. Interlocking pieces connect side by side or interlock in 3-D format. They are made of a 1/3 inch, 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. Fun to play with, soft and washable. Our kids line them up like a big train and then walk on them, reciting the letters. Remarks : The pack dimension is 8.25 " X 8.25 " X 2.75". Each square dimension is 4.45 " X 4.45 " X 7/16". Pack contains 28 Squares (1 for each letter). “When puzzle assembled on floor will make 31.15” X 17.8” mat”.