Covering a 6' by 6' space, it includes all 26 letters and numbers 0-9. The squares fit easily together like puzzle pieces with finishing borders to give it an enclosed feel. The pieces also have fun textures like waves, bumps, honeycombs, diamonds, and lines that babies love to touch. Keep in mind that the set will smell like plastic for the first couple of days so it's best to air them out in the basement or garage until you are ready to lay them out in your desired room. We had such great success with one set that we bought another for the living room.
It is available at Toys R Us for a new regular price of $34.99 (the old regular price was $39.99), but we waited for a sale and got both sets for $21.97 each.