The Masters Impact Tape for drivers and irons records the exact place of the impact on your clubface, and enables you to check the swing direction on the club. The shortcut to improve your score The carbon sheet (pressure detectable paper) records the hitting point of the ball. You can attach the sensor on the club sole and use it to check the swing direction. Check the momentum of the impact. Pack includes 10 Sets (10 Iron and 10 Driver)Does not leave any glue or marks on your clubs