Bongs and Glassware
The primary reason glass or high-quality stainless steel is used for bongs is that they're clean materials. When you heat a piece of clean glass or stainless steel, the only thing that really happens is the glass gets hotter. It doesn't begin to smoke or vaporize, it doesn't create toxic fumes, and it doesn't emit odors or flavors. That's why these materials are perfectly suited for smoking your products.
Bongs are defined because they have a water chamber. As smoke bubbles through the chamber, the water simultaneously cools the smoke and filters out heavy particulates, producing smoother, cooler, and all-around better-tasting smoke.
Spoon type pipes are widely used and are recognizable for their simple design. One end is a spoon-shaped bowl into which you pack your material. There is a small hole at the bottom of the bowl that allows smoke to travel from the spoon end down into the body of the pipe.
Dab rigs typically use the same water filtration system as a bong, but they include a number of additional features and components designed specifically for vaporizing super-potent concentrates at higher temperatures than those for smoking dry herbs. Instead of a bowl, for instance, a dab rig typically utilizes a nail or banger made from glass, quartz, or titanium. Once the heated chamber reaches the desired temperature, the concentrate is dabbed and filtered through water before being consumed.