The Corked Medium Butt Plug from Golden Triangle. This sleek, modern plug is perfect for all levels of anal play. From beginners to the most experienced, this is what you need! Made of silicone, for that firm yet bendable texture that you crave. Also for its superior hygienic qualities. Material: silicone. Waterproof. Length: 4.75â . Insertable length: 3â . Max Diameter: 1.25â . Min. Diameter: 0.75â .