Rimba Bondage Play - Ribbed Urethral Plug This urethral plug has stimulating ridges that the user will feel when inserting the plug, providing an intense orgasm. The length of the insertable part is 206 mm. The thickness varies between 6.5 mm and 9 mm. A convenient ring is attached to the end. Note: Always sterilize and clean the plug before use. To ensure smooth insertion, we recommend using lubricant.