Safe, soft, play giant interlocking foam floor tiles are a perfect product for designing specific play areas to suit your child"s lifestyle and needs. The giant interlocking tiles make excellent play mats, storage boxes, tents, and creative games. Each tile is made of high density foam measuring 12" x 12" and .5" thick making it safe for children of all ages from birth. It is soft, washable, durable, and colorful. The upper case letter set includes 36 tiles. The assembled mat covers a 6x6 feet (72" X 72"). Edges and corners sold separately.