The Nzonic V4 mechanical mod clone by EHPro is constructed of full 304 stainless steel. The telescopic feature enables the mod to equip a various range of battery sizes such as 18350, 18490, and 18650. Another great feature with this particular mechnical mod is the locking soft fire magnetic button which allows the voltage drop under 0.12 - 0.16V. Each unit includes a cloth bag and spare tube.Features:304 Stainless steel bodySilver plated copper contact pinsTelescopic for different battery fitmentsReverse threaded locking ringMagnetic firing button2 battery vent holes on bottom ring510 threaded connectionBlue rhinestone crystal in center of bottom firing buttonIncludes:1 x EHPro Nzonic V4 Unit1 x Cloth bag1 x Spare tubeNote: please DO NOT stack batteries as this is a mechanical mod with no circuitry, you will effectively double your voltage which can and will destroy attached devices