Ouch Silicone Vibrating Bullet Plug with Beaded Tip Urethral Sounding Black from Shots Toys. Ouch! Introduces a new line of toys for urethral explorers! If urethral sounding is your kink, then let these smooth probes deliver the ultimate pleasure! The urethra is lined with super sensitive nerve endings, which can be extremely pleasurable when stimulated. Additionally, deep urethral play is the only way to directly massage the prostate. Ouch! Has a variety of urethral sounding probes for beginners as well as advanced users! This vibrating model delivers the best of both worlds! The rounded tip allows easy insertion and the ribbed balls give extra stimulation. The probe comes with a single vibration mode going up to a staggering 12,000 rpm but is ultra quiet at less than 50dB. It takes one AAA battery included. Made from super smooth medical grade, phthalate free silicone, this toy has a total length of 8.3 inches with an insertable length of 4.41 inches. The diameter varies from 0.22 inch to 0.28 inch.