UWELL Whirl Replacement Coil Heads are developed for UWELL Whirl 20 and UWELL Whirl 22 Starter Kit. Made of Nichrome, the coil is a 1.8ohmresistance. If you are looking for economical coils, then Whirl Coils are exactly what you want. Get one pack for you Whirl Kit, it will bring you great mouth-to-lung vape and restricted direct-lung vape. 4pcs in a pack.