STIGA PERFORM 40+ 3 STAR PLASTIC BALL. The new manufacturing process has produced balls of unparalleled consistency which are pre-tested to ensure professional quality roundness, weight and stability. Only top grade material and the latest production techniques are used. Every ball in every box is perfectly round with a true bounce and no soft spots to allow you to take your game and enjoyment to the highest level. Approved by the ITTF.