Long Island Quartz caps are hand-made to precision by our master lampworkers. The highest quality German borosilicate glass is used to ensure clarity and durability. With a long tapered straw, the bubble cap stirs the terps around perfectly. The round bubble fits perfectly into LIQ banger's 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.