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 13.5" X 13.5" X 2.75" (Inches). Each square dimension is 6.6" X 6.6" X 0.5" (Inches). Pack contains 28 Squares (1 for each letter). When puzzle assembled on floor will make 42” X 24 ” mat.