Ouch Interchangeable Butt Plug Set Rounded Large Black from Shots Toys. Double your pleasure with this beautifully crafted light weight butt plug set. Made from high grade aluminum and silicone this version comes with a large rounded head, together with an interchangeable ergonomic handle and a powerful suction cup! Just take your pick! The large rounded head has a total length of 4.33 inches, a penetrable length of 3.35 and a maximum diameter of 1.38 inches.