The Castle Glassworks "Flash Art" beaker is elegant and durable. Made of borosilicate glass, this bong sits on a 12mm thick and 5 inch wide base making it a sturdy option for our smokers. The Flash Art beaker is made with a decal that is bonded to the glass and will not be easily removed. This bong comes equipped with a deep bowl that will give you a nice, even burn. Specifications Thickness: 9mm Tube w/ 12mm Base Height: 12 in / 30.50 cm Joint Size: 19mm Female Tube Diameter: 50mm Downstem Length: 5.75 in / 14.5 cm Included: Bong With Colored Glass Downstem and Bowl