REVTI Mica Band Heaters are sheathed with plated C.R.C.A. / Brass or Stainless Steel sheets. Heaters are provided with 1.5 mm asbestos insulation and stainless steel cover. The Heating Element (Winding) is of high quality Nickel-Chromium resistance wires. Heaters are available in One-piece and Two- piece designs. REVTI band heaters with EXPANDABLE design feature allows the heater to be opened for installation over the barrel without causing internal damage to the winding. Heater Terminals are properly placed so as to avoid cold spots.