Standard Nitanium RCS: Most popular 'rocking chair' curve with a moderate radius, which provides the maximum retraction efficiency with fewer archwire changes.Reverse Curve of Spee (RCS) Archwires are best suited for:Preventing molar tipping and rotations.Maintaining anterior torque.Initial leveling and aligning.Arch consolidation and expansion.Deep and open bite correction.Retraction of flared, protruding incisors.10 per pack.