The Vaporesso QF Meshed coils are purchased in a pack of three and are constructed of 100% organic cotton coils at a 0.2 ohm type. These coils are very compatible with the SKRR tank and function well at a wattage range of 50-80 watts in every use. The packaging of the Vaporesso QF Meshed comes with a Vaporesso hologram as well as a sticker of authenticity, giving you confidence that money is well spent. Vaporesso is one of the leading vape product brands in the entire industry, so it's safe to say that you can trust anything that they put out. These replacement coils are no different, and if you have an SKRR tank then it is in your best interest to invest in some spare coils!