I think their calculations are a little off. Soft, I measured around cock and balls and came up with 8.25" / 3 = 2.75" for the cock ring. My current metal ring is a 2" (I measured it and it is really 2-1/8 inches). My cock ring is a little snug, but I'm pretty sure 2-3/4" would be way too big.

If your are interested in buying an expensive metal ring, I suggest that you go to the hardware store and buy an assortment of O-rings of different dimensions and find one that fits and use that as your true measurement.

WARNING: DO NOT TRY THEM ON AT THE HARDWARE STORE! Otherwise, you may get your name and picture in the paper.