TP5 TRK-R is designed to provide accurate measurement data for indoor practice with radar-based systems. Inside the ball there is a small amount of asymmetrical infinity-shaped liquid silver which makes radar signals reflect more clearly with no impact on performance. The ball has the same five-layer construction as the standard TP5 model, with a Speed Wrapped Core for high ball speed and a 100% moulded urethane cover that gives grip and control around the green. It is USGA approved, which means you can use it both in simulators and in competitions.