Specifications:
21700 or 20700 or 18650 battery
Pure Copper
Minimal parts to ensure maximum connectivity and
Side-Firing, no spring for low voltage drop)
With locking mechanism at the bottom for safety 
Will not autofire even if in contact with metals outside the mod
Deep Engrave
Almost as tall as the battery
Single or stacked
Hyrid connection
Made solely in the Philippines
No clone