Ignite Butt Plug Black Dark Skin Tone Large from Si Novelties. Bum plug. Smooth shaft and an anchor base. The head of the plug is a little larger as you go down. The plug features a t-shaped base. Which makes it easier to use and to prevent plug from accidentially getting lost. Great for beginners and the next step up for anal play. Size length 5.50 inches, diameter 1.98 inches. Materials PVC phthalate free. Si Novelties – Ignite.