Sized For A Prostate Pummeling. Train up or down to your prostate’s content with the Stainless P-Spot Training Set from b-Vibe. This set of three steel plugs positively hits the spot with a range of length and girth to train your booty to take heavier and larger filling sessions. Made with body-safe stainless steel and a wide tapered base, this plug is perfect for comfortable, safe insertion and removal and is safe for use with all lubricants.