Since their humble beginnings in 2007, they have been one of leading manufactures in state-of-the-art coil building technology. It comes as no surprise that the replaceable Kanger SSOCC (Stainless Steel Organic Cotton Coil) heads utilize top-notch Japanese Organic Cotton. Coils are sold individually. Unlike your typical standard cotton, Japanese Organic Cotton is never bleached and is free of other common impurities. Kanger's replacement SSOCC heads are also wrapped with Nichrome wire and are sold in multiple resistances to satisfy the needs of every vaper. You can select from 0.5 ohm, 1.2 ohm and 1.5 ohm resistances, catering to virtually any type of vape.