Color: Black Diameter: 35 * 7cm Package weight: 32g / piece Delivery content: 1 x sliders fitness equipment [Application]: With the sound of our golf training aid, golfers can detect left arm curvature errors to help maintain a straight left arm position. This promotes the development of an effective and consistent swing. Suitable for all golfers and those taking golf lessons, especially beginners. [Sound Prompt for Incorrect Posture]: The golf swing trainer features an integrated alarm mechanism made from special material that produces a ticking sound when the elbow bends during a swing. This alerts the user to incorrect posture, prompting adjustment and encouraging a straight left arm. [Adjustable and Easy to Carry]: Strong Velcro and a secure buckle allow for easy adjustment and convenient wear. The durable plastic buckle is designed to avoid skin irritation, unlike thin metal buckles. Fits most users with an elbow circumference up to 33 cm. [Stable Fit and Effective Feedback]: Unlike simple belt-style trainers, this device wraps fully around the elbow, providing a secure fit that stays in place and delivers more reliable feedback during training. [Breathable Material]: Made from high-quality, breathable nylon fabric, webbing, and Velcro fastener, this training aid is lightweight, durable, and comfortable for extended use without causing discomfort.