Ouch Silicone Spiral Screw Plug Set Advanced 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 set of 4 twisted extra long probes have smooth pointed tips for easy insertion. The flat rounded head allows for safe and easy extraction. Made from super smooth medical grade, phthalate free silicone these probes have a total length of 6.1 inches to go extra deep! They have an insertable length of 11.65 inches and 4 different diameters measuring 0.28 inch, 0.32 inch, 0.36 inch and 0.4 inch. Always use with a generous helping of sterile water based lubricant and insert slowly and incrementally for maximum pleasure