Before we get into the specifics of Shots' Ribbed Steel Urethral Sounding Dilator, here's a little penis penetration PSA. Some folks find urethral sounding (also known as catheter play, penis penetration or urethral dilation) very enjoyable, but it's not something anyone should go into without plenty of research, time, patience and high quality tools. To sum up, please do lots of reading up before putting anything into your urethra! As for those high quality tools we mentioned, we've got that covered. 
In body safe stainless steel, the Ribbed Dilator is naturally extremely firm and weighty. It's probably best for more advanced sounding fans thanks to a broad tip and some dramatic ribbed texture along the straight length. There's also no distinct stopper or base, so you'll need to keep a close eye on things as you play.
Always follow a meticulous cleansing routine before and after using any urethral penetration device. The Ribbed Steel Urethral Sounding Dilator's stainless steel construction ensures extra through cleaning - boil or bleach it for reliable sterilization. Always use the highest quality lube with any tool that'll be entering our or your partner's urethra - the best option is a sterile surgical or medical grade water based formula.
* The Ribbed Steel Urethral Dilator is 9.4"/240mm long and .39"/10mm at the tip.