Each Aero-Swing Full Size weighs only 3.9 oz. but generates 10-12 mph of airflow resistance! Experience the newest innovation in golf swing speed training. This patented technology uses airflow restriction in the right moments of your golf swing to increase swing resistance that will ultimately help you increase your swing speed. Here ™s what you ™ll get: 1 " Aero-Swing Training Aid 2 " Sets of Stabilizers 1 " Carry Bag No Weights, Less Injuries! What are the advantages of Aero-Swing? Golfers can choose their level of resistance just by adjusting the position of Aero-Swing or adding another Aero-Swing to their club shaft. Golfers can hit golf balls while working on Speed Training No weights: Safer for everybody, especially Seniors and Kids Adding one device at the end of your club will result in 10-15 MPH decrease in swing speed Add a second device for 20-25 MPH decrease in swing speed. Advantages of hitting it longer: Shorter approach shots to the green: hitting a more lofted club like a 9 iron is way more accurate than hitting a 5 iron. More loft, more spin, shorter clubs are more accurate than your longer clubs. More reachable Par 5 ™s: Hitting it longer improves your odds of getting birdies in par 5 ™s. Get this part right and you ™re on your way to hitting it lower than ever before! More options " Many amateur golfers stand on the tee box of a par 4 or 5 and feel worried about not carrying over a water hazard or even onto the fairway. By hitting longer drives, the average golfer has more options and can attack holes without fear.