Koole full ceramic cartridge FCC is the best choice for vaping CBD oil and thick oil .It comes with newest vertical ceramic coil technology . Full ceramic pole .And up to the new CA heavy metal test standard. Your oil never comes in contact with any metal surfaces. Anti-leaking .Quartz glass body . Child-proof System --- Hand Press to Lock after filling oil. Customize the shape of mouth tip .Perfect match with all kinds of 510 cbd battery .Fill a syringe with a blunt tip needle with your desired oil .Insert the needle into the chamber between the center post and the outer tank wall.Depending on the consistency of oil , heating may be necessary to match the viscosity.Dispense oil into the chamber up to the airflow hole located on the center post. DO NOT OVERFILL as overfilling can cause leaking .Do not fill in the center post. Filling this in will cause blockage of the air path and leakage.Do not refill after first filling ..10 + Years Electronic Atomizing R&D Experience.100% Quality Control.Fast lead time & Stable Supply Chain.24/7 Customer Service.we provide users with pre-sale, sale, after-sales service and support the whole marketing chainwe provide users with pre-sale, sale, after-sales service and support the whole marketing chain.1. We have gained 9+ years experiences in this industry, Our products have passed CE, RoHS.2. We have strong R & D team, so we can control the quality strictly. All products are tested strictly before shipment.3. We aim to supply the best service to our customers.4. All our products have 6 months warranty.5. Prompt delivery.Delivery Time: 5-7 working days after payment confirmed (Based on small order).Shipping Way: DHL, FEDEX, UPS. Air shipping .