Buttman's Viewable Glass Butt Plug Doubler. Buttman says works better than any butt plug I have ever used. Meticulously designed glass butt plug with wide neck for maximum internal viewing. Even the handle is clear of the viewing area. Ultra hygienic borosilicate glass can be boiled to clean and is dishwasher safe. Experiment with different temperature play. Place under hot or cold water to heat up or cool down. Finally a plug for people who see things ButtMan's way. 8 inches long by 2.9 inches wide. 15 ounces.