This glass butt plug in pyrex can be heated or cooled. The mini butt plug in pyrex glass is designed to give you a variety of feelings. The glass anal plug is a work of art with its sexy shape throughout. Material: Glass. Length: 3.75 inches. Width: 1.5 inches. Height: 1.5 inches. Girth: 5.88 inches. Weight: 5.00 ounces.