Come and see our amazing products. The arc-shaped design accords with ergonomics, feels comfortable and can be used for a long time. a good choice to kill time, very suitable for adults and children with anxiety and autism. Puzzles exercise the left and right sides of the brain simultaneously. They are a mental workout that improves problem-solving skills and attention span. Doing puzzles reinforces connections between brain cells, improves mental speed, and is an especially effective way to improve short-term memory. Quantity over3,000 pieces is the price of shipping. Pls confirm with us about the packing info, stock color and exact production time before placing your order.