The Castle Glassworks "Grey beaker"is simple, 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 color logos really stand out and will last a lifetime. This bong comes equipped with a deep bowl that will give you a nice, even burn. Specifications Thickness: 9mm Tube w/ 12mm Base Height: 14 in / 35.50 cm Joint Size: 19mm Female Tube Diameter: 50mm Downstem Length: 5.75 in / 14.5 cm Included: Colored Glass 19mm Downstem and 14mm Bow