Premium grade silicone four (4) piece Butt Plug Set. Black color silicone butt plug set with 4 different size diameter options. You will love it! Diameter for every desire. Plugs have got a stopper finn at the bottom to prevent further unnessecary penetration. Biggest Plug Diameter: Ø5.2 CM ( 2.0'' ) Bigger Plug Diameter: Ø 4.2 cm ( 1.7'' ) Medium Plug Diameter: Ø 3.5 cm ( 1.4'' ) Smallest Plug Diameter: Ø 2.7 cm ( 1.1'' ).