Hollow grounding plug with a long tapered neck and thick knot for gentle entry, inner ridges stimulating as you move. Smaller size: 6 inches total, 5 usable, 7.5-inch widening circumference, 7oz. Strong platinum silicone, non-toxic, phthalate-free, warms quickly, flared base. Lube-safe with water-based, hybrid, and oil formulas.