Envy Glass blows a wide range of american made glass that has three distinct characteristics function, form and affordability. All of their products are produced using Boro Schott Glass in Southern California. These pop rock inline straight tubes greatly improve on standard inlines with inserted fritted glass which creates much more diffusion and greatly improves the quality of each hit. A ice pinch is also added to further cool down each hit for the consumers enjoyment. These pop rocks inlines tubes are available in array of colors and are a real treat!