Six large rings interlace inside a one-inch diameter silver ring. Smaller rings hold them in place. The pendant comes on an 18" silver or gold-colored metal chain. It is comprised of large and small aluminum rings, each available in 18 different colors. That gives you the choice of 324 different possible combinations!
 
NOTE: The images currently all show the pendant on a black cord eventhough this listing is for the pendant on a metal chain. Photos for those are still in the works.