The atomizer coils are crafted with quartz for a crystal clean purest and smooth experience. Rapid heating, get hug clean hits with QDC(Quartz Dual Coil) Technology. QUAD coil : Unique QUAD coil technology by using quarts rod coil, made for giant cloud and hits, perpect for cloud chasers which is hard to come by 5 pcs a pack (Please Note : These coils do not include the lids for the coils) Fast Heating High-Quality Quartz Rod High-Grade Titanium Coils Perfect Balance Of Flavor And Vapor