The plug has a hollow design. to allow urination and ejaculation and design, with a smooth round ball at the front to prevent the dilator from slipping in, making it safer to use. Color: Silver S: Size: 13 * 0.8 cm/5.11 * 0.31 inch M: Size: 13.1 * 1.0 cm/5.15 * 0.39 inch L: Size: 13.4...