Twenty-six letter tiles make up this set, one for every character in the alphabet, and each 12.5 by 12.5 inch square carries a punch-out letter children can pull free and slot back in. At 0.4 inches thick the EVA foam cushions knees during crawling and floor exercise, and the non-slip face holds position on smooth flooring. Laid flat the tiles become a play surface; stood on edge they lock into walls and boxes, so the same 5.5 pound set doubles as a construction toy in a playroom or classroom. Pink and white pairing keeps each letter legible against its tile. Recommended from ten months, the mat can be split into small sections for a reading corner or joined into one long run down a hallway.