The C grooves on the putter face are angled 20 degrees upright, proven to reduce side spin, roll the ball earlier, reduce skid and resistance to twist on miss hits! Other milled putter faces produce more skid and lead to inconsistent roll, whilst the C grooves roll the ball almost instantly. Harold Swash, the legendary brains behind this theory proved this to be true with the ball "sticking" to the intended line! They are the best putters ever and the brand has the tour use to back it up with many tour pros still using them to this day, including Matt Fitzpatrick.