The seals are made of 2024T3 Alclad aluminum for lighter weight and superb strength. They're coated with a plastic anti-chaff strip where the seal comes into contact with the control surface to prevent any abrasion.
Aircraft respond well to the gap seals as they create a pressure barrier between the high pressure air on the bottom of the wing and the low pressure air on the top of the wing. Gap seals will add 2-3 mph to the plane, as well as 100-150 ft/min increase in rate of climb. stall speeds will decrease in the 1-3 mph range. Handling is greatly improved, especially low speed handling and stability.