CCell adapters screw onto the bottom of 510 oil cartridges to magnetically attach to 510 batteries. These are original manufacturer parts compatible with the CCell Palm or Silo Batteries. One of the many features the CCell is famous for is its amazing magnetic cartridge connection system, which resides inside the battery itself. CCell adapters are made from steel allowing the magnet to make a firm connection with the cartridge. This type of magnet connection will allow the cartridge to easily spin within the device making it extremely easy to properly line up the cartridge with your mouth. Features: Standard 510 Thread Aluminum Alloy Housing Magnetic Connection