Tretorn Micro-X 72 Ball Box - Yellow
Tretorn's micro cellular technology is patented worldwide and recognized by the International Tennis Federation as the pioneer of a new category of tennis ball. Instead of compressed air, Tretorn Micro X is filled with 700 million air-filled micro cells that cannot escape through the ball's rubber core, resulting in a ball that never loses performance.  Each ball is surfaced with Tretorn's exclusive Flex-Felt, specially designed from wool and polyester fiber for unsurpassed feel, playability, and wear resistance.  72 balls per box. Color: Yellow.