The Rainbow Bowl Piece by Empire Glassworks features custom color tubing by Golden Gate Glassworks. The color is blown and worked into this dazzling bowl piece and sand blasted with Empire's signature flame stamp. This bowl is so sweet, it may give off it's own terpenes. Features: Worked Borosilicate Glass Custom Golden Gate Glassworks Tubing 14.5mm Male Joint Empire Glassworks Sandblasted Decal