Name: wooden sphere puzzle. Please note the size: 2. 95 x 2. 95 x 2. 95 (inch). Colour:Wood color Material:wood Recommended for ages 5 & up, children should be used under adult supervision. It is a puzzle that will entertain and challenge all ages. Hard to take it apart, but harder to assemble. When assembling requires careful observation and thinking, analyze its internal structure. Our mind puzzle help to exercise brain, develop intelligence, improve problem-solving ability, and also relieve pressure. Tips: paper instructions and video link qr code is prepared, but in order to make it challenging and fun, we suggest you try your to unlock this wooden ball puzzle without instruction. Burr Puzzles have been found in Europe and Asia since the 18th century, It embodies the wisdom of the ancients, Burr Puzzles can take on many shapes, from the traditional burr seed shape, to balls, stars, and more. This Burr Puzzle is specially designed to disassemble and reassemble, wooden Puzzles are classic and popular Puzzle Game toys. The wooden puzzles may look simple, but they contains lots of mysteries, they are usually easy to disassemble but difficult to assemble. Each wooden Puzzle is special and unique. Playing with wooden Puzzles can not only exercise brain, develop intelligence, improve problem-solving ability, but also relieve pressure, relax mood and gain pleasure. You and family will have quite a lot of fun through this interlocking brain toy. Package Contents:1 x Burr Puzzles Note: Light shooting and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.