Product description:Color: Black Diameter: 35 x 7cmPackage weight: 32g or 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