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Innovative Design: The bounce back tennis ball features a unique training base that can be filled with water or sand for stability, ensuring it remains in place during your practice sessions Solo Training Made Easy: The elastic rope ensures that the Bounce Back Tennis Ball rebounds automatically after each hit, enabling you to focus on perfecting your serve, forehand, and backhand techniques efficiently Anti-entanglement: Equipped with a thicker core and wool felt, our tennis balls offer superior rebound and durability; The anti-entanglement feature ensures the rubber string stays tangle-free Durable Construction: The bounce back tennis ball features a high-premium structure with a thickened rubber inner liner and elastic nylon rope for long-lasting use Lightweight and Portable: This tennis practice device is designed as kettle structure; After training, you can open the cap, pour out the water or sand; There is a handle on the side, which makes carrying more convenient and comfortable