Product description:Color: Black Diameter: 35 * 7cmPackage weight: 32g / pieceDelivery content:1x sliders fitness equipmentApplication: 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 beginnersSound Prompt Incorrect Posture: The golf swing trainer elvow 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 straightAdjustable 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 cmNot 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 betterBreathable 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