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These heads work with the Penguin Atopack, Penguin SE Atopack and the Dolphin Atopack. Available versions include the 0.25ohm, 0.6ohm and 1.2ohm. All are built with ceramic housing to produce amazing flavors with adequate vapor. The 0.25ohm coil is a direct-to-lung coil while the other two should be used if you enjoy mouth-to-lung vaping.