These are the metal dots that go on the ball for all the radar based systems such as Flightscope Mevo, Mevo+, X3, XI, XI +, XI Tour, X2, X2 Elite, and all the Trackman systems. Some people prefer overlapping the single dot into a snowman shape and lining the narrowest point between them in line with the target with the snowman facing the sky. I have taken the overlap and made it into a single easy to install dot to reduce wear and overlapping and catching on a screen.
The metal dot increases the ability to get an accurate spin reading from the radar unit when using indoors. My dots have been tested time and time again and perform perfectly. They actually last longer then the stock dots as they are just slightly thinner and conform to the ball better, which results in less wear on your net or screen and less wear on the dot itself.