Each cartridge has a press on connection, and features a ceramic coil for the best oil vaping. The press on mouthpiece is permanently secured, which means it is tamper proof and prevents exposure of the contents inside. These CCell cartridges have a universal 510 thread conection and are made of polycarbonate, making them more durable. We also have several different styles of mouthpiece for this cartridge which also come in bulk quantities. These Cartridges feature a press-on connection that takes special machinery to assemble. Not for private use. Looking for a personal reusable cartridge? Check out our wide selection of threaded cartridges and mouthpieces !