New 2021 Black Series Tour Lock Pro 40Gram. Tested by Professional golfers and Touring Pro's in different Tournaments. Includes 1-40gram,1-Locking tool and Manual. Counter Balancing your clubs made easier with the new Tour Lock Pro Technology. This counter weight is proven to give you more accurate putts, smoother stroke and balanced feel. Amateur and Professional Golfers tested, improves the accuracy and feel of the club. Recommended for Putters. Immediate Noticeable Effect: 1.) Improves Distance 2.) Smoother Swing flow 3.) Solid Hit 4.) Less Misses/Playable misses 5.) Pendulum Effect 6.) Really Good feel/More Confidence 7.) Better Control Thank You for Visiting! Enjoy Shopping with Confidence from a Highly Respected Seller.