The Callaway Chrome Soft X Golf Balls with RPT (Rapsodo Precision Technology) are custom-designed golf balls that combine Callaway's tour-proven performance with advanced technology for precise spin measurement and indoor training.Features: RPT Print Pattern Technology - Custom designed with a unique print pattern specifically engineered for the MLM2PRO Impact Vision camera system High-Speed Camera Integration - Compatible with 240 fps high-speed camera capture for pro-level spin measurements Precision Spin Measurement - Provides spin measurements within 1% of the accuracy of high-priced launch monitors These balls are required for spin measurement functionality with the Rapsodo MLM2PRO system 12 Callaway Chrome Tour RPT Balls

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