FeCrAl Meshed-H 0.8 Ω / 0.4 Ω CROWN M Twin-coil (MTL & DTL): 0.8Ω Recommended Power: 15W - 18W. 0.4Ω Recommended Power: 30W - 35W. MTL & DTL. FeCrAl Meshed-H 0.6 Ω CROWN M Coil (RDL): 0.6Ω Recommended Power: 20W - 23W. RDL. Includes: 4 X Crown M Replacement Coils.