Rimba Bondage Play - Ribbed Urethral Plug This urethral plug has stimulating ribs that the user will feel when inserting the plug, providing an intense orgasm. The plug is hollow and has a shower mouth at the end with 6 holes that allow liquids to come out. The length of the insertable part is 126 mm. The thickness varies between 6 mm and 9 mm. Note: always sterilize and clean the plug before use. To ensure smooth insertion, we recommend using lubricant.