This special butt plug is made of glass. The glass is transparent and has a beautiful deep blue colour. The wavy shaft provides a lovely sensation when the plug is inserted. The flat base keeps the toy perfectly in place in any situation. Glass is strong, durable and safe for use in combination with any type of anal lubricant. It is also suitable for Temperature Play. You can warm up or cool down the butt plug by putting it in water for a few minutes.