This is a ball mark repair tool which is used to repair the dents on golf greens caused by the ball landing on the green.
Most repair tools are stamped steel or cast zinc. This repair tool is milled from stainless steel or aluminum which is then anodized. It’s ergonomic, clean and stylish.
The thumb recess is textured with some tight grooves. The laser-etched brain on the back side is there to remind the golfer to “putt with both sides of your brain.” http://www.brexgolf.com/putting-tips/