KINGOU Wooden Primary Color Octagon Lock Logic Puzzle Burr Puzzles Brain Teaser Intellectual Assembly Toy Material: Oak. Paint: Water-based paint, touch smooth. Size: 7.5 x 7.5 x 7.5 cm. Recommended for ages 5 & up, children should be used under adult supervision, water-based paint, touch smooth. Difficulty Rated: To make it challenging and fun, parcel without paper instructions, if you need solutions, please contact us.