This is a Titan-stem aluminum downstem by Ace Labz out of California. The titan stem is the world’s first adjustable downstem. It is precision machined so that all the pieces fit together like a charm. The aluminum is anodized so it has a smooth and non-stick finish. This aluminum downstem is made from aircraft grade aluminum using the latest cnc machining technology. This unit comes with 3 different diffusers. This downstem is able to be adjusted to fit an 18mm joint as well as a 14mm joint. It also has an adjustable length of between 2.5 inches and 8.5 inches. If you are looking for a downstem that will not break like a normal glass downstem. Then this is defiantly the product for you!