CCell adapters screw onto the bottom of 510 cartridges to magnetically attach to 510 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