The Hades style mod is made from pure stainless steel, with a mix of stainless silver accents. The mechanical mod uses a 26650 battery size, with vented air holes to keep the battery cool. The top cap is equipped with an adjustable center pin and both caps are copper contact pins to create a strong conductivity. Along with the device, the fire cap button is supplied with magnetic switch or optional spring. Overall Length: 22 mm Copper construction Copper contacts Gold plate springs Houses an 18650 battery