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. 10 separate pieces mix and match forming myriad puzzle formations. UV inhibitors preserve color outdoors.