Titanium, Tungsten Carbide, Nickel, and """"Self-Rusting"""" Black Star inserts (grooves are manufactured to USGA specifications) make the Spin Doctor RI Wedge the most versatile wedge in golf. In addition, patented Reverse Groove training insert will give you 250 - 400% more backspin instantly. We guarantee you'll spin it like the pros! You would have to spend over $1,000 in wedges to play the technology available with (1) Spin Doctor RI Wedge. With its classic design the Spin Doctor RI Wedge ensures superior ball striking and lifetime playability. The replaceable Spin Doctor Reverse Groove training insert will give you 250 - 400% more backspin instantly. Your friends will be amazed at how you spin it back like the pros green after green. This insert simply reinforces proper ball striking by putting the fun back into the short game fundamentals. We GUARANTEE you'll spin it like the pros with this insert ! This insert is not approved for USGA tournament play. """"If you have never been able to spin the ball, you're going to love this 'Reverse Groove Training Insert' You'll have fun while learning to spin it back like the pros."""" Philip Davis, SW PGA Teacher of the Year You can get all of this technology with your Spin Doctor RI Wedge! Choose From Pro-Style Diamond Insert (grooves manufactured to USGA specifications) Pro-Style Titanium Insert (grooves manufactured to USGA specifications) Pro-Style Nickel Insert (grooves manufactured to USGA specifications) Pro-Style Tungsten Carbide Insert (grooves manufactured to USGA specifications) Pro-Style """"Self Rusting"""" Black Star (grooves manufactured to USGA specifications) Reverse Groove Training Insert If you have any questiona about this product or would like to order by phone, please call us Toll Free at 888-733-8383. We look forward to hearing from you!"""  (less)