CCell Refillable Cartridge For anyone unversed in the benefits of the CCELL cartridge,( ceramic core cartridge) you’ll quickly find that it's design offers superior airflow ideal for higher viscosity concentrates. CCELL carts are also refillable, with their craftsmanship holding up through a dozen refills in some cases. Made for 510 cartridge connections ** please note cCell carts are a brand and might be slightly different than the CCell carts we are currently carrying. If you have any questions or concerns please contact us ***