The Easy Valve Liquid Pad Set (2-pack) for Storz & Bickel is intended for use with the Volcano Vaporizer with the Easy Valve system. It also works with the Plenty Vaporizer. The liquid pads are made of stainless steel providing the optimal surface to vaporize liquids and oils efficiently. These pads can absorb as much as 10 drops at a time. You should start with a lesser amount of liquid increasing it until you achieve the optimal flavor you desire. Each order includes 2 pieces of liquid pads (approx. 28 x 4 mm).