The SMOK TF-Ti Replacement Coil is intended for use with the TFV4 Sub-Ohm Vape Tank. These coils use Grade 1 Titanium wire for those seeking an alternative to Ni-200. This vape coils unique design in intended to be used with temperature controlled devices to provide superb flavor and a nice warm vapor. Temperature control helps prevent and burnt taste from burnt juice or wicks. Made from stainless steel and wicked with pure organic cotton. The SMOK TF-Ti Replacement Coils are available in in 0.33 ohm these coils function best between 450F-600F.