UWELL Whirl Replacement Coil Heads are developed for UWELL Whirl 20 and UWELL Whirl 22 Starter Kit. Made of Nichrome, it has 0.6ohm coil resistance. If you are looking for economical coils, then Whirl Coils are exactly what you want, since each one supports vaping with 8 tanks of e-liquid. 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.