products description: Have you been vexed with golf. Maybe you need some help about correcting your elbow movement. This item is designed for golf beginners that can't swing in a proper way, if you do it in a worry way, the alarm would make sounds to remind you to keep your elbow straight while your swinging. It also helps to increase the power of your swing by forcing you swing with a wide arc of arm swing without bent elbow movement. This trainer is made of nylon, durable and lightweight, adding no burden to golf practicing. Get one and start your new journey of golfing. Feature: 1. Made of quality nylon, durable and lightweight.2. Helps remind you to keep your elbow straight.3. The alarm makes sounds when you bend the elbow. 4. Strengthens the power of your swing.5. Suitable for golf beginners. Spec: Material: NylonColor: BlackLength: approx 17 cm / 6.69'' Width: approx 11.5 cm / 4.52''Weight: approx 60g Package Includes: 1 * Swing Trainer Only