DIAL Cast Metal Puzzle from Hanayama Puzzles of Japan is both a delightful and tricky brain teaser puzzle. It consists of a "Triangular-Shaped" interlocking two-pice cast metal body body and two internal round disks. The object is to remove the 2 internal discs. The second puzzle is to replace/ re-assemble back together. Measures approximately 2 inches tall and .56 inches thick. This is a really fascinating disentanglement brainteaser. You may find yourself turning the center disks around and around for longer than you planned. DIAL Hanayama Puzzle is a NEW 2017 Design release. Recommended for ages 12 to 105 years. NO force is used to solve. Forcing pieces may damage the puzzle !! Includes Red Velveteen Drawstring storage pouch. Measures approximately 3 x 4 inches laying flat. Rated by the manufacturer as a level 5 difficulty (on a scale of 1 to 6 where 6 is the most challenging.) Difficulty level shown on the packaging. Your own experience could vary substantially. DIAL is part of a series of 60 plus very interesting and mentally provocative metal brain teasers from the Hanayama Puzzle Company. Some serious puzzlers refer to these as "disentanglement-style puzzles" as they involve taking something apart and then re-assembling. Re-assembly can also be a puzzle and may be equally as tricky. Reminder. NO FORCE is ever required to solve the puzzle. Just a series of clever moves.