A modern lawn tennis ball is made from two main materials:
Lawn tennis are basically made of 3 materials
The felt helps control the ball’s speed, spin, and aerodynamics.
Rubber core
The inside is a hollow shell made from natural rubber blended with synthetic rubber and other additives.
The shell is pressurized with air or nitrogen (in most standard balls) to give the ball its bounce.
Felt covering
The outside is covered with a fuzzy felt made from a blend of:
Wool (typically 50–70%)
Nylon (typically 30–50%)