3-D Puzzle Play Forms Features, Molded polyethylene plastic for indoor and outdoor use. UV inhibitor holds color in sunlight. 6 Pieces designed for inter-changeability. Flip Puzzle Curve to change direction. Flip Puzzle Straight solid surface on one side, storage on the other. Height designed just under 12" for age appropriate use. 12"-15" safety wide surfaces. Interlocking puzzle ends hold fast with no pinch points. Lightweight portability. Excellent seating height for all ages.8 Puzzle Straight pieces, 4 Puzzle Curve pieces form a play center around our soft expanded vinyl 67" sq. checkerboard mat. 91" sq. footprint as shown.