Cool Carb CapsThe Empire Glassworks Jellyfish Carb Cap is made to fit most quartz and titanium banger nails. Handmade in the USA with American glass rods. Features a UV reactive jellyfish design that glows under blacklight. These caps give you directional airflow while you are dabbing that helps ensure that you get the most efficiency with your concentrates and they get completely vaporized. Diameter measures 26mm wide.