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. 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 in some setups (depends on net and complete setup) 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. We also do offer the OEM thick dots as well if that works better for your screen and set up.