Features: Through sound to warn their incorrect posture to golfers, and then correct by self to make arm in straigh, therefore it can gradually form effective and desired hitting; Fit all golfers or golf instruction, especially works great for beginners. Sound Prompt Incorrect Posture, Built-in alarm device which made of special material makes a 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. Adjustable and Easy to Wear, Strong hook&loop and buckle make it adjustable, easier to put on and take off; The thick plastic buckle will not scratch your skin; It fits for people whose elbow circumference is below 33cm. Non-Slip and Better Warning, Our golf training aid swing can be worn around the entire elbow, not easy to move and meanwhile give a warning if your arm is bend. Breathable Fabric, This golf training aid swing is made of quality nylon breathable cloth, webbing and hook&loop closure, durable and lightweight, never give much pressure to your elbow. Specifications: Color: black Material: Nylon breathable cloth + webbing + HOOk&LOOP Size: 17×11.5cm/6.69"×4.53" Package Includes: 1 X Golf Swing Elbow Corrector note: Transition: 1cm=10mm=0.39inch Please allow 0-1cm error due to manual measurement. pls make sure you do not mind before you bid. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you!