This XXXL Black Rubber Butt Plug is the big one. Standing at 8 inches high and 4.5 inches wide, it dwarfs your average butt plug. Anal enthusiasts endeavor for months or years to take on this monstrosity. This is the Everest of Butt Plugs.
Measurements: 8 inches in length, 4.5 inches in diameter
The XXXL Butt Plug is the yin, to your yang. You've found what you're looking for.