The smooth-sanded, hard maple wooden blocks are available in typical shapes, including squares, rectangles, cylinders, arches, triangles and half circles. The base block is 1" x 2" x 4", and all other pieces are designed as multiples of the base so differing elements can be stacked to equal one another. Three sets are available: Junior, Advanced and Master. The set comes in a sturdy box with instructional information on creative and open-ended play. This product is intended for children over the age of 18 months. Launch date: January 1, 1985.