Application: With the Tik tok sound of our golf training aid, golfers can detect errors in the curvature of their left arm to keep the left arm in a straight position; Therefore, an effective and desired stroke can be formed gradually; Suitable for all golfers or golf lessons, especially for beginners. A posture warning is issued: During use, a false posture warning sounds to the golfer when the elbow is bent. Then correct yourself to stretch the arm so that it can gradually achieve an effective beating effect. Suitable for all golfers or golf trainers, especially suitable for beginners.Breathable Material: Our golf swing training aid is made of high quality breathable nylon strap with zipper, durable and lightweight; It won't put you under pressure. With a high degree of flexibility, you can easily put your elbows in the cuff to create and maintain the correct distance between your left foot and your right knee. Not easy to change and better to prevent: compared to other providers who use a simple belt, our golf swing trainer is all around the elbow, ours is not easy to move, and it can warn golfers better. Note: The data are all manual measurement, please please allow 1-3cm error, due to the light and display difference, there will be some color difference, depending on the physical object received.