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 35.7 cm while the diameter goes from 0.35cm to 0.75cm 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. - Size dilators: 3.5 mm - 4.5 mm - 5.5 mm - 7.5 mm - Materials: Silicone