*The material of top and bottom panels : Urushi wood, Rengas wood, Purple-heart wood Opening method of the puzzle box : 12 steps Moving panels and Slide keys : have 3 panels / 2 keys Outside size : 3.5x2.6x2.0 inch (90 x 60 x 50 mm) Inside storage space size : 2.20 x 1.92 x 1.37 inch (56 x 49 x 35 mm) Includes Description (solution sheet) and the gift box. Urethane finish.