Tube electro and mechanical Mod. Mod means modified are boxes or tubes designed for use rebuildable and intended for experienced vapers because they have no security system, so it is better to be well informed and ask a seller before buying a tube. It takes some knowledge of electricity to be able to use a tube safely. With tubes the batteries must be impeccably wrapped (packed) to avoid short circuits or outgassing

In the tube category we also have electro tubes, no danger with them because they have a protection system like ordinary electro boxes. More info in the category Box