KINGOU Wooden Tetrakaidecahedron Lock Logic Puzzle Burr Puzzles Brain Teaser Intellectual Removing Assembling Toy Material: Wooden. Size: .2.36 x 2.36 x 2.36 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.