These tennis spheres, unlike their pressurized counterparts, maintain bounce not through internal air pressure, but primarily through the composition and density of their solid rubber core. Their rebound relies on the elasticity of this dense material rather than contained gas. A common example is their usage in practice settings where consistent bounce over an extended period is prioritized over initial liveliness.
Their significance resides in their longevity and consistent performance. Because they do not lose bounce due to air leakage, they offer a reliable option for training and institutional settings. Historically, their durability has made them a cost-effective choice for tennis programs with high usage rates. Their unchanging bounce characteristics also provide a stable and predictable playing experience.
