... more than 20 years, our main heating wires or ribbons as follows:1:FeCrAl resistance wire 0Cr27Al7Mo2,0Cr25Al5,0Cr23Al5,0Cr21Al6Nb,0Cr21Al6,0Cr21Al4,0Cr19Al3 ... ,0Cr15Al5,0Cr15Al52:NiCr resitance wire or strip Ni80Cr20,Ni70Cr30,Ni35Cr20,Ni30Cr20,Ni60Cr153:CuNi resistance wire or strip4:stainless steel wire or strip5:other heating elements