Magnetic hat clips are used to clip on your golfball marker. This makes it very easy to have ready for when it is time to putt. Also, it is a good way to not loose the ball marker. Many golfers (myself included) would keep the ball marker in my pocket. By mid round I would loose it most likely when I was driving or taking items in and out of my pocket.
Once I got into using the magnetic hat clips it was super easy. That is all I use now. Check out some of the super strong magnetic ones we carry. in silver or black.