24 Gauge AWG Kanthal A1 Resistance Wire (0.51mm) 2.04 Ohms/ft - 50ft spool with wire guard Resistance = 2.04 ohms/ft at room temp Wire Diameter: 0.51mm (0.02in) Shape: round Spool comes with a wire guard to keep your wire from unraveling. It is reusable and just snaps on! 100% SATISFACTION GUARANTEE: We stand by our products and if you are not happy, we are not happy and we will gladly give you a refund. We have 100% positive customer feedback for a reason!