It's been made to greatly enhance aesthetics and reduce friction. It is done by two common air-spray or electrostatic method. The composition in the wire has 55% Nickel and 45% Titanium. The primary nickel-titanium orthodontic wire alloy was promoted because of the Unitek Company who at the moment are referred https://pasteldirectory.com/listings13103139/a-simple-key-for-rectangular-niti-wires-unveiled