Inspired by Mr. Okiyama's Twin Box, Kawashima's Twin 3 Box is imaginative and well-constructed. Very ingenious opening mechanism. We consider this puzzle to be among his best works. This puzzle has Two secret spaces! Can you find them both? Crafted in Magnolia, Oak, Keyaki (Zelkova), and Purple Heart, it measures 115 mm. x 60 mm. x 60 mm. Released in November 2015 this is a limited edition puzzle. Will arrive in gift box and opening instructions