Urethral Sounding Ribbed Plug with Ring is made from stainless steel material. The strong metal give this sounding a tough look and makes it easy to insert into the urethrae. An O-ring for easy and delicious pull out, combined with ridges for extra enjoyment. Sounding is exciting, because it's fairly unknown, different, risky and non-traditional. The urethra passes by particularly sensitive areas in the penis head and the G spot. Sounding stimulates these nerves directly, offering a great sexual impulse for those who dare. Tip Diameter: 8 mm.