Product information 1.Material: Stainless steel, Pyrex galss tank, keep high-temperature insulation core 2. Specification * RBA: with replacement wire * Connector: 510 * Capacity: 4ml * Resistance: 0.35ohm * Insulation core can be resistant to high temperature 280°C * Japanese organic cotton * Length: 77mm Diameter:22mm Feature:Can drip oil from the hole on top part without open drip tip.