It is a kind of Plastic which looks like glass. Acrylic is Durable, non Fragile and Light Weight. Our acrylic bong comes with High Gloss premium finish. Our bong include Metal Bowl & Stem, Metal screen fitted into bowl to hold your material and rubber and 1 pc of extra grommet. Machined from high-quality aircraft aluminum, naval brass and stainless steel, the original six shooter pipe is the classic revolver pipe - a novel yet well-constructed piece that will soon become your favorite pipe with six separate bowls that rotate, you can fill each one with different strains, or have a fresh bowl every time you pass the pipe. The unit features one recessed screen port that serves all six bowls, and the ball bearing is totally protected from the smoking area. This acrylic grinder comes with high quality accessories that ensure fine crushing of your smokeless. This herb grinders made of variety of material via acrylic, wood, aluminum etc. These grinder come in an assortment of colors so each purchase is a pleasant surprise.