Instructions Application: Suitable for all golfers or golf courses, especially for beginners Adjustable and easy to wear: Velcro closure and buckle make it adjustable and easier to put on and take off thick plastic buckle will not be as thin as other The metal buckle will scratch you like that fit arm range: 20-30cm or 7.87-11.81 inches [not easy to move, more discreet]: Compared to other sellers that are just belts, our golf aids swing around the entire elbow. Breathable Fabric: Our golf swing coach uses high-quality nylon breathable fabric and straps and Velcro, durable and lightweight it will not add stress to you. [SIZE FOR EVERYONE] Easy to put on and take off, the adjustable hook-and-loop straps fit most people's arms and elbows up to 33cm long. Suitable for left and right golfers, as well as women and junior golfers to help them perform well. Correct MemoryWith this excellent golf swing trainer, you can maintain a good muscle memory of your arm, practice more correctly, keep your left arm straight, and form an effective and ideal shot. Features Material: Nylon Breathable Fabric and Webbing and Velcro Color: Black Size: 17x11.5CM Weight: 55g Package Included: 1 Golf Swing Trainer Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.