Master Series The Spire Quattro Vibrating Cock Ring with Anal Plug. The Spire Quattro is designed to keep the wearer in pleasured submission, while the insertable anal spire vibrates and provides breathtaking pleasure. This piece features a bulbous anal arm for stimulation, while the cock and balls are confined within their own snug harness, providing extended erection enhancement. The flexible material stretches to fit and bends to move with the body, for intense internal stimulation with every thrust and movement. The vibrating bullet encases in the anal plug offers 4 speeds of intense vibration, controlled with a wired remote.