Replacement 1.3Ω OC CELL coils for use with the Vaporesso Orca Solo kit. Rated 7-12W.The difference between the two types of coils is the CELL technology is faster heating and a smoother vape, and the OC coil has organic cotton wicking designed to provide cleaner flavour and more vapour. Both types are designed for mouth-to-lung-style vaping. It's just a matter of personal preference. The kit comes with one of each so make a note of which one you prefer.