Check the listing for details. Golf Swing Trainer Smart Ball Golf Swing Teaching Aids for Posture Correction. Color: Black, Condition: New. Listed at 9.79 USD. Package include : 1pc smart ball +1pc pump Quick Start for Beginners: The feeling of strangeness will wear off with only a few exercises. Effectively coordinate your body and arms to improve your swing skills and find the correct hitting point as quickly as possible. Quick Inflation: Come with a thick and heavy-duty inflator pump – readily available for constant air supply. Just pull and push the rod back and forth to inflate the ball. Ideal Swing Training Aid: This smart ball helps you understand how arms and body move to strengthen your muscle memory. Correct your swing posture in time to restrain “chicken wings”. Reliable Material: Made of fine and smooth PVC fabric with soft fluff, it is tender and comfortable to touch. And it features excellent air tightness. No worry about air leakage! Easy to Use: First hang the ball on your chest, adjust the length of the neck rope to the most suitable position for you and finally clamp the ball between your forearms to keep the posture.