KINGOU Wooden Ball lock Logic Puzzle Burr Puzzles Brain Teaser Intellectual Removing Assembling Toy Material: Bamboo. 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: To make it challenging and fun, parcel without paper instructions, if you need solutions, please contact us. 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.