Specs :· Patented Baby-X Coil Structure· Four Large Wicking Ports·  Organic Cotton Q2 - Dual Core· 0.2ohm · Rated for 30w - 80w / 45w - 60w Recommended Wattage Range M2 - Dual Core· 0.25ohm · Compatible with 3.7v Mechanical Mod T6 - Sextuple Core· 0.2ohm · Rated for 40w - 110w / 70w - 90w Recommended Wattage Range X4 - Quad Core· 0.13ohm · Rated for 30w - 70w / 45w - 60w Recommended Wattage Range