Vandy Vape M Coil Replacement Coils are mesh style coils composed of perforated Kanthal A1 material. These sheets of mesh measure in at 16mm by 7mm with a resistance of either 0.15ohm, performing best at 50 to 70W and a 0.2ohm which is best at 40 to 60W. This mesh should be dry burned at 15 to 20W.