The VooPoo VMATE V2 Replacement Pod Cartridge holds 3ml and is easy to refill. It works with the VOOPOO Vmate Kit Infinity Edition as well as the VOOPOO Vmate E Kit. Pods with resistances of 0.7ohm and 1.2ohm are accessible. It is made of PCTG and Silver Ion. This Pod Cartridge is sold in pairs.