Boasting a smooth. slim shaft and stainless steel roller ball perineum massager. the Glide is perfect for solo experimentation or partner play. The shaft is shaped for easy insertion and optimum prostate stimulation while the roller ball at the base glides against the perineum simultaneously. Made from phthalate-free polypropylene. it is waterproof and compatible with Nexus iSTIM. Shaft length is 4.57 in.. width is 1 in.