From the FAQS ----> Pro shop...
Durability: Will display how many hits the ball can absorb before being taken out of play
Each ball can only be used for a limited number of shots. The number of hits will be tracked and displayed on the swing interface in the game under the HITS meter. This will give you an estimate of how many hits you have left with that ball. Putts are not counted as a hit to the ball.
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You really didn't think that the whole 100 credits you spent on a sleeve of balls was going to last your entire golfing career, did you?
bwlngfntc2000mur: that i could only use it for 1 week why upgrade at all
Because using the starter balls suck?