The Beaker Basics is the perfect starter piece and is what a lot of people begin with and then build from there. It comes with our Tall Mouthpiece, the 7mm Classic Beaker Base, an 18mm joint, and then a downstem and bowl. It also comes with your selected aluminum clamp. The clamp is made of an aluminum exterior lined with a specialized rubber interior, along with a lever on the side to close and tightly seal the two pieces of glass together. On the interior of the clamp, there is a built in rubber gasket ridge where the two pieces of glass butt up against making a very safe and secure seal.