These Smok Tech dual coil 1.5ohm cartomizers are best innovation to come to cartomizers. Each 1.5ohm dual coil cartomizer contain two 3.0ohm coils that generate approximately 1.5ohm. Due to the increased heating area, these atomizers produce huge amounts of vapor and are less likely to fail due to the high (3.0ohm) coils inside. These cartomizers are compatible with any device with a 510 thread (eGo,Riva etc) Each cartomizer hold approximately 1.6ml in eliquid. They are not compatible with regular 510 batteries.