RING Hanayama Cast Metal Brain Teaser Puzzle Four intertwined rings release very easy. Objective to to reassemble as a smooth ring. Rated as a level 4 difficulty on a scale of six (where 1 is easy and 6 most difficult.) Your experience may differ. This puzzle is an enlarged reproduction of the Famous Turkish/Wedding 4 Band Puzzle Ring. 1.7 inch diameter. Much TOO big to be worn as jewelry. Polished metal 4 piece brainteaser. Even when apart the rings are still interlocked.. One of over 45 different pocket size metal brainteasers from the Hanayama Puzzle Company of Japan.