Slide this stainless steel rod inside for arousal enhancing sensations! The rod has graduated bumps so you can enjoy a wider stretch as you insert it. The hollow tunnel allows for more space for lubricants and other bodily fluids that may pass through or get inside. Keep it from going too deep by pulling the retrieval ring to remove the hard rod from your shaft. Run hot or cold water over the sound prior to insertion to add an extra sensational element with temperature play! Use any type of lubricant you like as long as it is a sterile lube for best results.Make sure the sound is clean before using it. Use a sterile lube and use it liberally. Begin to part the urethral hole and slowly slide the rod tip in. As each larger bump slips in, enjoy the gradual stretch as it enhances sensation and sends waves of pleasure through the core of your shaft. Gently stroke the shaft with your hand and feel the pressure from the inside and outside at the same time! Before you fully release, remove the sound by pulling the retrieval ring and let yourself go!Measurements: Overall length: 6.4 inches, Insertable length: 5.1 inches, Widest insertable diameter: 0.47 inches, Inner diameter: 0.15 inches (4mm)Materials: Stainless steelColor: MetalNote: Do not heat or cool to extreme temperatures urethral tissue is sensitive and could be damaged.Key Features:Tapered, Bumpy Sound: This stainless steel, nickel-free sounding rod is tapered for easy insertion and has delicious bumps that get larger the deeper you go!Hollow Tunnel: This urethral sound has a hollow tunnel at the base so there's room inside the rod.Retrieval Ring: Keep things from going too deep or getting swallowed up with this easy to use retrieval ring! Simply pull on it to pull out.Temperature Play: Run the sound under warm or cool water to change the temperature of the sound before playing.