Their life span is about 15 to 20 hours depending on the intensity of play. Beyond they lose liveliness and rebound and agree me.
Their strong point is their price, I always bought about 12 batch 3 tubes of 4 balls about 1 / ball.
But then I see that they rose 4 and increased to over 16 the lot. At that price, I would really advise, and prefers to fall back on Head Pro (whose rebound is best for a little longer).
In short, it is an excellent plan to 12 the lot beyond it is not worth the shot :)
