Bongs come in all shapes and sizes. While they do all follow the same concept, there really is little difference between them. In comes the 550mm classic chamber glass bong, however, and it changes everything. It is a simple glass bong, which means you can see everything that is going on. Most importantly, it has a much longer than average neck. This means you have to employ all your lung power to get a hit out, and this will increase the strength and flavor of your mix so much more. Plus, you can have fun trying to see if someone may not be strong enough to actually get a hit with just one puff or not..