Looking for replacement coils for your Fireluke Solo or Freemax tank that takes FL coils? FL Mesh Coil adopts the latest FM COILTECH5.0, also known as Double-D Mesh, which is upgraded from FM COILTECH4.0. FM COILTECH5.0/Double-D Mesh features an innovative parallel mesh structure with two single mesh coils connected in parallel, so the flavors and heating speed of the FL1-D mesh coil can be significantly improved by 50%.