Homogeneous film is  deposited on high alumina ceramic rods . Stainless steel lugs are fimly  pressed on the metallised rods. Resistors are trimmed to achieve the precise resistance tolerance by cutting a helical groove on the film  layer.  The resistors are coated with  flame proof epoxy for electrical, mechanical and climatic protection, alpha numeric marking is done with respect to designated value on coated resistor.