Made of borosilicate glass, this bong sits on a 9mm thick and 5 inch wide base making it a sturdy option for our smokers. Our Demon beaker is elegant and durable. Made of borosilicate glass, this bong sits on a 9mm thick and 5 inch wide base making it a sturdy option for our smokers. The Demon beaker is made with a decal that is bonded to the glass and will not be easily removed. This decal also features a decal window below the downstem joint so you can still know how clean your piece is with a full wrap. This bong comes equipped with a deep bowl that will give you a nice, even burn.