Golf Training Aid Swing elbow trainer Golf Posture Brace for Beginners TrainingThrough Tik-tok sound to make golfers discover their left arm curving mistake, so as to keep the left arm at a straight position, therefore it can gradually form effective and desired hittingBuilt-in alarm device which made of special material makes a Tik-Tok sound immediately if you bend your elbow when swings golf.It prompt you that you are not in correct posture, you should adjust posture and keep left arm on straight.Strong hook and loop strap and buckle make it adjustable, easier to put on and take off.Our golf training aid swing is made of quality nylon breathable cloth + webbing + hook loop strap, durable and lightweight; It will not add you pressureColour: BlackSize: 18*13cmQuantity: 1pc1.As different measuring methods,it will occur 1-3 cm deviation about the items,please ensure that it is okay for you before ordering.2. Because of different monitors and lamplight, the picture may not reflect the actual color of the item, really thank you for your kind understanding.3. Only the above package contents, excluding other products.