Our colorful play mat provides a cushioned surface for babies and tots. Great for romping and rolling, it turns any floor into a giant play surface. It's great as a padded floor for your play yard, too. Unlike many others, ours is even safe for newborns! That's because the interlocking tiles are a full 5/8" thick and the dense foam material passes the baby bite test. Tiles also make great building blocks and towers, and have pop-out letters, numbers and shapes for practicing the basics. Standard set contains 30 pieces to form a 6' x 5' rectangular play surface. Edges and corners interlock to frame the mat. Each tile measures 12" x 12" and each edge measures 3 1/2"W x 12" L.