Dr. Joel Kaplan Silicone Inflatable Plug from California Exotics. Inflatable Silicone probe with easy squeeze bulb. Pliable and durable. Quick air release valve. Superior suction cup base. Silicone (probe, hose, bulb) ABS (release valve). 3.75" x 1.25"/9.5 cm x 3.25 cm (before inflation).