18-step Natural wood 8.5cm/3.3inch Cube Japanese puzzle box by Hiroyuki Oka

*The walnut wood used for the side panels is made by joining multiple pieces rather than from a single board. Opening method of the puzzle box : 18 steps Moving panels and Slide keys : have 4 panels / 2 keys Outside size : 3.3 x 3.3 x 3.3 inch (85 x 85 x 85 mm) Inside storage space size : 1.9 x 2.5 x 2.5 inch (47 x 65 x 65 mm) Include Description (solution sheet) and the gift box This puzzle box is the Cubic design and It's opened by 18 steps. The design is 4 types natural wood (nyatoh, mizuki, rengas, urushi wood). The Japanese puzzle box is made from only wood. This puzzle box is made by Hiroyuki Oka. All the internal gimmicks are made of wood, so the warmth of wood. The simple and gentle movement of the mechanism gives healing and comfort. The surface of the puzzle box is painted with a safe transparent paint.