1955 – Inventing the permanent pressurised tennis ball
In 1955 it was time for Tretorn’s next big innovation. This was the year we invented and submitted the patent for the permanent pressurised ball or pressure less ball. The same tennis ball is used all over the world today.
Pressures less balls are designed differently from regular tennis balls in the sense that pressure less balls have bounce built into the rubber core and cannot lose pressure or bounce over time.
The only time they need replacing is when their cover becomes worn. This, on average, occurs within 1-2 years. Today, TRETORN still produce the most advanced and playable pressure less balls in the world.