Features: Color: Black Diameter: 35*7cm Package weight: 32g/piece Package content: 1x Sliding training equipment [Usage]: With the sound of our golf training aid, golfers can detect errors in the bending of the left arm to keep the left arm in a straight position; Therefore, an effective and desired stroke can be gradually formed; Suitable for all golfers or for taking golf lessons, especially beginners [Audible signal incorrect posture]: The Elvow golf trainer is an integrated alarm device made of special material that immediately generates a tick-tock sound when you bend your elbow during the swing. It warns you that you do not have the correct posture; You should adjust your posture and keep your left arm straight [Adjustable and easy to carry]: Strong Velcro and buckle make the golf training aid adjustable, easier to put on and take off; The thick plastic buckle will not scratch the skin like other thin metal buckles; It fits most people's arms, elbow circumference up to 33 cm [Not easy to change and better to warn]: Compared to other suppliers who are a simple belt, our golf trainer is around the entire elbow, ours is not easy to move and it can warn golfers better [Breathable material]: Our golf training aid is made of high-quality, breathable nylon material + webbing + Velcro, is durable and lightweight; It will not put you under pressure