Our superior cartridge provides a pure taste for either our pufCBD Remedies or our addCBD drops! The tank is comprised of medical-grade pyrex with an organic cotton coil. Standard 510-threading, 0.5mL capacity, and 1.2mm intake hole. 100% leak-proof with a top airflow system. Our cartridges are disposable, and will require replacing every 1-1.5mL (2-3 fillings).