Long Island Quartz caps are hand made to precision by our master lampworkers. We use the highest quality German borosilicate glass to ensure clarity and durability. With a long tapered straw the bubble cap stirs the terps around perfectly. The round bubble fits perfect into our bangers deep beveled edge. Thick with a low center of gravity it will not fall off while in use. These caps are perfectly designed to work with our bangers as to not waste any material.