Airless Tennis Ball, a design based on improvements from other designs.

Improvements:

Improved hex mesh density to add strength and functionality in a wider range of materials.
General increase in thickness for a better feeling of weight and bounce.
Polished seam line to achieve homogeneous bounce capacity throughout the entire ball and better aesthetic approximation.

Material:

TPU 95A resists impacts without breaking but has a bounce reduced to about 15% from drop height.