The medical-grade material of the refillable pods feature integrated coils with varying resistance. It has been specifically designed for the VooPoo V Thru Pro Cartridge. There are two different types of pods inside V Thru Pro Pod with 1.2 ohm GENE Helix coil and the V Thru Pro Pod with 0.7 ohm Mesh Coil. Both pods have a large 3ml e-juice capacity. The 0.7 ohm Mesh Coil produces layers of rich flavors and features three times larger heating area and for long-lasting, rich, and robust flavor with high nicotine delivery choose 1.2 ohm GENE Helix coil. The perfect fit of the mouthpiece, ergonomic design, and leak-resistant body makes it a desirable choice.