XIANQI Product description: Color: Black Diameter: 35 * 7cm Delivery content:4x sliders fitness equipment [Application]: With the sound of our golf training aid, golfers can detect their left arm curvature error in order to keep their left arm in a straight position; Therefore, an effective and desired stroke can gradually be formed; Suitable for all golfers or taking golf lessons, especially beginners [Sound Prompt Incorrect Posture]: The golf swing trainer is an integrated alarm device made of special material that immediately generates a tik-tok sound when you bend your elbow while swinging. It alerts you that you are not in the correct posture; You should adjust the posture and keep your left arm straight [Adjustable and easy to carry]: Strong Velcro and buckle make the golf training aids swing adjustable, easier to put on and take off; The thick plastic buckle does not scratch the skin like other thin metal buckles; It fits most people's arm, elbow circumference up to 33 cm [Not easy to change and better to warn]: Compared to other vendors which is a simple belt, our golf swing trainer is around the entire elbow, ours is not easy to move and it can warn golfers better [Breathable material]: Our golf swing training aid is made of high quality, breathable nylon cloth + webbing + Velcro fastener, is durable and light; It won't put you under pressure