These "Suspensions" are high powered rare earth kinetic art sculptures by Los Angeles sculptor Bruce Gray. For pricing, the one on the left 10" tall with 3 strings at $400, then 24" in the middle with 4 large magnets for $1200, then on the right is the 16" tall version with 4 strings at $500. Those are high powered industrial rare earth neodymium iron boron magnets on the ends of the cords, and also on the frame of the circle, to hold the magnets in place by magnetic force alone. I am frequently out of stock on these very popular items. If you are planning to order one as a gift, I strongly suggest ordering at least 2-3 months in advance.