The EyeLine Golf(R) SloMo Screen Putting Aid is the perfect training tool to analyze your putt and learn how you can adjust your method to improve. Simply set up using your smart phone to record in slow motion, putt as normal and review. Using this system allows you to record a video in slow motion to identify whether you or your student's ball rolls, hops or backspins. Design Excellent coaching tool Works with most models of smart phones System includes SloMo Screen, SloMo Screen stand clips, MyRoll Ball (3 pack), smart phone holder and carrying bag Designed to work with left-handed and right-handed golfers