Experience unmatched durability and versatility with GENZY tennis balls, crafted from natural rubber and extra-duty felt for consistent performance and reduced shock. Designed with a thickened liner for superior sealing and long-lasting bounce, these high-elasticity balls are perfect for training sessions, coaching, or use with throwing machines. Their exceptional durability makes them ideal for both youth and professional practice, while their multi-functional design allows them to double as dog toys or even massage balls to relieve fatigue. A thoughtful gift for tennis enthusiasts, coaches, students, or even your pets like cats and dogs; these tennis balls offer reliable performance and endless uses.