Silicone Beginners Plug Set Urethral Sounding Black from Shots Toys. The super smooth medical grade, phthalate free silicone twisted model has a smooth pointed tip for easy insertion while the curls give extra stimulation to the urethra. The rounded knob allows safe and easy extraction. The super smooth medical grade, phthalate free silicone nail model has a smooth pointed tip for easy insertion and widens towards the end for extra stimulation. The rounded knob allows for safe and easy extraction. Always use with a generous helping of sterile water-based lubricant and insert slowly and incrementally for maximum pleasure. Straight plug measures 5.9 inches in total length insertable 3.7 inches. Curved plug measures 6.1 inches in total length insertable 5.7 inches.