?Size Selection Method ?The 48 inch is recommended for individuals 5?6" or taller, or those who are stronger and more advanced in their golf game. The 40 inch length is ideal for those who are under 5?6" or who are at a beginner or intermediate level ?Swing Correction & Improvement ?Convinient swing tempo trainer best essentials for the beginner practice. Improve your golf swing tempo and swing plane with the heavy head and slightly flexible shaft to deliver more consistent golf shots off the tee ?Ideal Golf Trainer for Busy Crowd? You can carry it anywhere and practice indoor day or night. No limit to the usage scenario as the small space. Ideal golf trainer for the urban busy crowd! ?Building Muscle Strength?The flexible shaft will naturally give you feedback to adjust the tempo and swing plane for a more. Build muscle memory and strengthen your swing with the 2.5lb. It is good way to give you more power and better control ?30 Days Money Back?100% money back guarantee for any issue in 30 days, 90 days warranty support. You have no risk to try!