The glass butt plug is a genuine product by Phallix Glass. Phallix Glass is the world’s leading manufacturer and distributor of functional, erotic glass art. Drawing on over ten years of experience and expertise in glass production and in excess of 400 glass artisans, Phallix dominates the erotic glass market. Phallix products are made from medical grade borosilicate glass ("hard glass") of which Pyrex is a brand. This material (essentially "lead-free crystal") is completely non-toxic.