Refers to Glass-On-Glass, or GonG. Standard water pipes (bongs) use a glass
slide and a rubber stopper to seal off the chamber, but GonG is a more advanced system that involves precision laser glass
cutting so the GonG pieces fit perfectly together, creating a more efficient means of smoking. GonG is also a way to "add on" to your
bong, including ashcatchers, filters, diffusers, pretty much anything that is compatible. The most common sizes for GonG accessories are
14.4mm and
18.8mm(referring to the width of the glass opening). Glass-on-Glass bongs hit harder and smoother than conventional bongs.