Felt cover
- Blend of natural wool and synthetic nylon fibers
- Premium balls have a higher proportion of natural wool and the felt is usually woven
- Cheaper balls have a higher nylon content
Rubber core
- consists of either natural rubber or synthetically produced rubber
- the core of premium balls is almost always made of natural rubber
The filling: air or gas
- with unpressurized balls, the two halves of the core are glued together without the addition of air or gas
- Depending on the manufacturer, either air or a gas mixture is fed into the internal pressure balls
- There is no set standard for the internal pressure, which is usually between 1.6 and 2.2 bar
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