Color: Black Diameter: 35 * 7cm Package weight: 32g / piece Delivery content: 1x 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 those 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 aid 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, with elbow circumference up to 33 cm. [Not easy to move and better to warn]: Compared to other vendors which offer a simple belt, our golf swing trainer wraps around the entire elbow. Ours is not easy to move and it can warn golfers more effectively. [Breathable material]: Our golf swing training aid is made of high quality, breathable nylon cloth, webbing, and Velcro fastener. It is durable and lightweight. It won't put pressure on your skin.