Perforated box-like mass. Made from two pieces of nearly isomorphic coiled up.. Interesting because there is a squarish shape to turn in a different direction or movement. The puzzle writer Edi Nagata of Japan design.　 "The cause" and is? "Has caused" and the adult inspiration and logic to solve the puzzle. The Mission's "off." And "back to you". Simple, but profound. And take full advantage of the head and hands, I try to challenge you. Product specifications: ages: 6-year-old-difficulty: 4 (out of 6) size: 75 × 119 × 45 (mm) weight: 166 g