Matrial: Stainless SteelThe effective length of about 205mm / 8.2”， with a rotary switch， the ball diameter 10 mm / 04”.The front end of the metal part of the catheter is about 60mm / 2.4”， the rear end is about 20 mm / 0.8 “， an outer diameter of 8 mm / 0.3”， an inner diameter of 3 mm / 0.12”Silicone tube diameter 6mm / 0.24”， length 125mm / 5”， with two ring inner diameter is 25mm / 1” and 30mm / 1.2”Do Note: Do thoroughly disinfect before use. Use lubricating fluid， otherwise it will pain， a water-soluble lubricant best.Afterwards， drink more water to urinate.Do not get into reluctantly， in order to avoid hurting urethra.Be sure to slowly expand， do foreplayIf you want more excitement， before you plug in the urethra， insert a vibrator in anus.