If you're into sounding (or urethral penetration, if you prefer) you know that this practice isn't something anyone should go into without lots of prior research, time, patience and a great set of high quality tools. These are those tools!
Sounding is an extreme form of play that involves inserting a rod or plug up through the penis via the urethral canal. For some, it provides a completely unique sensation and lots of pleasure, since the head of the penis and urethral canal is jam-packed with nerve endings. Sounding is also used as a means to direct prostate stimulation, while some penis-owners get off on the extreme nature of sounding. In either case, it's not something to be done on a whim, so if you're interested, please do your research!
In body safe stainless steel, the 12 included Rose Bud Sounds are naturally extremely firm and quite weighty. Each probe (other than the first, which is straight and 11.5"/29.21cm long) is identical in shape and features a length of about 12 inches/30.5cm. A swell at each tip ranges in size and thickness from .04"/.1mm to 4.72"/120mm, so you or your partner will be able to choose the one that best fits your experience level and/or stimulation requirements.
Always follow a meticulous cleansing routine before and after using one of these (or any) urethral penetration deice. The Rose Bud Sound's stainless steel construction ensures extra thorough cleaning - boil them or bleach them 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.