*There is a base ring and then 5 rings that rotate . To complicate matters, the top 4 sets of rings are all notched, so they will expose or hide some of the numbers on the ring below as the rings are turned. Makes for a lot of possible combinations! It essentially turns the 16 columns into 24 possible columns. Its quite a challenge.
*Beautifully made in USA at our Spring Hill shop with highest quality rings and laser engraved numbers. The base ring is 1/4" thick to provide strength and the top rings are 1/8" thick . The Dia of the puzzle is a bit over 5"