Ouch Silicone Rugged Nail Plug Set Urethral Sounding Black by 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 3 nails 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 nails have a total length of 6.1 inches, an insertable length of 5.9 inches and 3 three different diameters measuring 0.35 inch, 0.5 inch and 0.64 inch. Always use with a generous helping of sterile water based lubricant and insert slowly and incrementally for maximum pleasure.