Tretorn Series + Tour All Court 4 pcs

A tube consists of 4 balls.

Tretorn Gas-filled balls with Tri-Tec ™. The world's first 3-part multi-layer construction. The third part is a closing membrane between the core and the outside which helps to maintain pressure and performance in the ball.

It holds the pressure significantly longer than conventional gas-filled balls, which over time lose tension and playability when the pressure disappears. Tretorn gas-filled balls also have a woven felt and a rubber coating to maintain pressure for a long time.

Tretorn Series + is an official ball at several ATP World Tour events.