This Six Step Urethral Sound Plug is made of high-quality 316L Surgical Steel. It is hollow to allow fluids to pass through the plug.

Each successive bulb on the plug gets slightly wider in diameter (starting at 6mm and ending at 10mm), culminating in an 18mm ball on the end which acts as a flared base to prevent over-insertion. This plug is 5.5" long (4.75" insertable length).