Stens Notched Air Lift Blades create significant air flow that pulls grass blades upwards for a clean, concise and uniform cut. By pulling grass blades to stand up straight, air lift blades can cut them all at the same height for greater consistency and a more manicured appearance. These blades are ideal for thick and lush lawns because of the strong air currents they produce. Powerful air circulation quickly and efficiently discharges clippings. Because of intense air circulation, notched air lift blades are not recommended for lawns with thin or bare spots that could result in dust and sand being kicked up. Notched air lift blades are best used on mowers with more powerful engines. For lawns that are thick and vigorous, Stens Notched Air Lift Lawn Mower Blades will produce a professional looking cut that makes lawns look luxurious.