Material: Beech External size: 5 x 1. 46 x 1. 46 inch; inner size: 2. 75 x 1 x 0. 5 inch. Recommended for ages 5 and up, children should be used under adult supervision, water-based paint, touch smooth. You can hide a ring, a clue of gift or other surprises in it. Colour:Wood color Burr Puzzles have been found in Europe and Asia since the 18th century, It embodies the wisdom of the ancients This Burr Puzzle is specially designed to disassemble and reassemble, wooden Puzzles are classic and popular Puzzle Game toys, can train and develop your logic & improve your IQ, suitable for both young and old. 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, a lot of fun to play with. 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 Puzzle toy Note: Light reflection 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.