ZW BiTi .Ant.017×.025 Niti .Pos.016x.016 36m Upper - PK/5

With technology advancement, the dream of having two wire sizes or materials built into the same arch wire becomes a reality - The anterior segment is thicker to maintain torque while the posterior segment is thinner for less friction during retraction. - Joining hook could be used for elastics, coils or lacebacks