Today hand pipes come in various shapes, models, sizes and materials. Most of the glass hand pipes have excellent quality and amazing designs. Beautiful glass pieces are always the assets of glass manufactures. In that case Grav Labs glass manufactures are popular all over the world. Grav Labs offers Helix pipes, steamrollers, bongs, bubblers and even mouthpieces. They are world renowned for their pieces and the prices are more than fair. Combination of Grav’s scientific glass and the functionality of…