You Could return products to us by downloading the Returns Kind and subsequent the measures proven on the form. NiTi or Stainless Steel wires are coated with Teflon/5META/Tooth colored epoxy resins. 4 Coating materials are synthetic resin or plastic resins such as epoxy resins.3 Coating improves esthetics and lowers friction https://www.ortix.co.uk/wires/