These are the same Pro V1 golf balls used by professionals, but with specialized RPT (Rapsodo Print Technology) markings that enable precise spin rate and spin axis measurements when used with Rapsodo's MLM2PRO launch monitor.Features: MLM2PRO Impact Vision camera captures unique print pattern of RPT golf balls for precisely measured spin rate and spin axis. Uniquely engineered 27 marked RPT print pattern guarantees complete 360 rotation of ball is captured and measured. Play the same Pro V1 you use on the course and get measured spin with your Rapsodo MLM2PRO. Recommended to players who are looking for mid-trajectory flight, very low long game spin and maximum short game spin, with softer feel. 12 Titleist Pro V1 RPT Balls

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