These are the same exact cartridges as the silver metal and glass cartridges except these are gold! This cartridge is our best selling carridge. It has four oil hole size and four airflow holes, which can ensure big vapor. The heating coil is ceramic, which brings pure taste and no burnt flavors. For this one, the quality is stable and we can make it anti leak 99.5%. We provide different oil hole size for different thickness oil. Different colors silver, gold, black and rose gold available. Welcome to inquiry about the logo print and package customize. Free feel to contact us!