ITEM NAME:Shell Lock Puzzle Metal Brain Teaser Intelligence Game for Adults Children Description: Eco-friendly material and high quality Very classic and quite interesting Good for creative thinking and improve both your IQ & EQ After getting each puzzles solved by yourself, then you will get achievement, but we still attach a diagram to satisfied with some people Great gift for adults and children Material: Alloy Size Chart: Size: approx. 4 x 4 x 1.8cm/1.57 x 1.57 x 0.71inch Package Includes: 1 Piece Shell Puzzle.1 Piece Shell Puzzle. Great gift for adults and children. Material: Alloy. Eco-friendly material and high quality. Size Chart Size: approx.