KINGOU Wooden Puzzle 24 PCS Interlocking Brain Teasers Toy Intelligence Game Logic Burr Puzzles for Adults/Kids Material: 24 pcs Interlocking Puzzle. Size: 2.95 x 2.95 x 2.95 inch. Recommended for ages 5 & up, children should be used under adult supervision, water-based paint, touch smooth. Degree of difficulty in our store: Paper instructions and video link QR code is prepared, but in order to make it challenging and fun, we suggest you try your best to unlock this wooden interlocking puzzle without instruction. 30 Days satisfaction guarantee:If you received items do not meet the satisfaction, you can return. For more information, please contact us.  Guarantee fit for only if the products are intact and unuse.