The Castle Glassworks 18" Straight Tube Bong is built for smokers who demand maximum durability, smooth performance, and bold visual impact. Crafted from heavy-duty 9mm thick borosilicate glass, this premium water pipe is designed to withstand daily use and intense sessions while delivering consistently clean, powerful hits. Key Features: • Height: 18 in / 45.75 cm • Glass Thickness: 9mm heavy-duty borosilicate glass • Joint Size: 19mm Female • Tube Diameter: 50mm • Downstem Length: 5.75 in / 14.5 cm (removable) • Design: Classic straight tube • Base: Extra-thick flat round base • Finish: True electroplated, glossy permanent coating