Sensory play with comfort in mind...This pliable plug features stainless steel interchangeable head rings and a stainless steel tip. The shaft is hollow silicone, which bends naturally, affording comfort and flexibility. The cum-through feature assures ultimate satisfaction. Made entirely of the most hygienic, allergy-safe, and high quality materials. Measurements: Plug: 4.2 inches in total length, 3.75 inches insertable, 0.3 inches in diameter; Ring arm: 0.9 inches in length; Large ring: 1.2 inches in diameter; Small ring: 1 inch in diameter