Package includes: 3 tethered tennis balls. Size and cord: Ball diameter about 6.3 cm; cord length 4 m; elasticity approx 1.4 m. Construction: Felt outer shell with a elasticity rubber liner; hard rubber core for solid feel and durability. Durability and performance: Upgraded felt and rubber improve elasticity and resilience; designed to be resistant to bursts and long lasting under regular training. What you get: Reliable ball and consistent recoil for repeat practice without chasing the ball. Use scenarios: Solo practice at home, gym, or yard: tethered ball returns to you for continuous hitting, timing, and footwork drills. Coaching or partner drills: simulate rallies and servereceive scenarios with immediate feedback on rhythm and stroke accuracy. Beginner or kids training: easy to handle, safe to use, helps build basic technique and confidence. Compatibility and versatility: Suitable for training spaces that accommodate a 4 m tether; compatible with wall mounts or stands used for tetheredball drills.