Folding, clicking puzzle of arranging gears to match challenge cards, one side features colors. Fold and arrange gears to match images printed on 40 challenge cards. Great for ages 6+. Exceptionally strong, safe, high-quality materials, bpa free. Take this brainteaser anywhere you go! Strengthens Visual-Spatial Skills. Challenges Critical Thinking, Logic Skills. 2 Ways to Play (Colors on side 1, Black & White on side 2). 4 Levels of Difficulty. Gears Click as they Pivot also a Fidget Toy. Sparks Sensory Stimulation. Gears shift up to 255 degrees. Exceptional flexibility. Chain of gears measures 14 inches. High quality materials. Lasting durability.