Ouch Urethral Sounding Dilator Set Black from Shots Toys. The Ouch! Urethral sounding dilator set is comprised of 4 phthalate free high grade smooth medical silicone dilators, which can be used incrementally for urethral play. They can be used to create immense stimulation and to gradually open up new realms of pleasure. These simple looking dilators can produce incredible sensations and help build up strong erections and powerful orgasms. They are ideal for BDSM play and especially for creating medical play experiences. Each of the dilators has an insertable length of 14.06 inches while the diameter goes from 1.4 inches to 2.95 inches for a gradual comfortable increase. Each plug has a square end for easy extraction. Warning: if not conducted carefully, sounding carries a risk of irritation, tearing of the urethra or of urinary tract infection.