Apco introduced Mini Ribs to the Market in 1997 with the release of the legendary Bagheera. The only serial class wing to ever take first place over all in a PWC.
Mini Ribs improve performance by streamlining the airflow towards the trailing edge of the wing. The Mini Rib allows this gain without much additional weight or bulk, as would be the case if one used full ribs. Drag is the biggest enemy to paraglider performance, and this is a elegant way to reduce it.