These cartomizers were designed specifically for use with Dual Coil Tank (DCTank) Tubes. A 510 drip tip and DCTank tube is needed in order to use these cartomizers. There is a hole punch on the side of them so may leak if used without a DCTank Tube.
All cartomizers must be replaced eventually, but feel good knowing that you're replacing your old ones with the best of the best. These new cartomizers contain two heating coils instead of one to produce more vapor than your standard cartomizer. They have been designed to work great with Puff batteries, eGo batteries or any other PV (Personal Vaporizer).