Create your own cities and towns with this Happy Architect set! Made of smooth Birch plywood, this 28-piece wooden play set is suitable for ages 2+. An open-ended activity for unstructured play, these blocks feature black surfaces to draw on with chalk (not included). The non-black side is coated with non-toxic lacquer. The pieces feature pre-cut grooves for easy set up. Sizes range from 9.7"L x 5.7"W to 5.7"L x 4.6"W.