Mancage Model 15 Chastity 3.5 inches Cage with Plug from Shots Toys. This specific model is equipped with a urethral sounding dilator. Made from smooth, flexible medical grade silicone, which clicks into the bottom of the device and goes into the opening of the urethra. The total length of the dilator is 8.07 inches, the insertable length is 7.87 inches and the diameter is 0.137 inch.