Aero Wrap II is a worm gear oscillation system with a specially designed pitch to create optimal oscillation speeds for the Propulsion Spool Lip design. It provides uniform line lay and winding shape to prevent loss of energy during the cast while providing longer casts than other oscillation systems. So, casting distance increases with less effort required. (Aero Wrap II is not available on Saros reels, which are equipped with Slow Oscillation.)