NS Novelties Crystal Small Pink Glass Butt Plug. The entire Crystal collection is made of 100% hand blown, premium Borosilicate glass. These items are of the highest quality, and represent the most vibrant and durable glass products available today. Crystal items can be heated/cooled to personal taste. No matter the size, our Crystal glass plugs are a stunning display of erotic art. This beautiful design is available in 3 different sizes, with 2 color options available per size. Each sold separately. The small Crystal premium glass plugs are 2.5 inches tall. Butt plug dimensions 2.5 inches by 1.37 inches. Material Glass.