Smooth threaded tapered shapeRounded tip for easy insertionComfortable plug stays in placeFlared base for easy retrievalEasily warmed or cooledEmbedded rainbow jewel baseStorage bag includedNickel free aluminum alloyBody safe & phthalate freeAvailable in 3 sizes3.7" (94mm) Length / 3" (76mm) Insertable / 1.53" (39mm) Width