All yellow line blades mean sharp side leads on counter-clockwise-rotating trimmers.
Unlike weak, traditional monofilament line, Aero-Flex Line Blades are engineered to lift air and grass for a clean cut with their sharper leading edges. The 4 powerful line blades hit and cut vegetation more frequently during each revolution. As an added bonus, they cut and mulch at the same time. Also, their more rigid design, greater mass and twice the cutters means more grass cut per rotation, to get the job done faster.
Quantity of 32.