Probably expired date on them and after that date the school (and the regulatory agency) won't let them be used for official use.
I have seen an older softball bat explode from too much use, it developed cracks till finally the end flew off.
My daughter had a favorite bat we had bought her and one tournament the ref. stopped the game as she came up to bat. He inspected the bat and told her to get a different one as that one was outlawed. Come to find out it had an expired date.
The school system probably had to purge them and had bought new ones the first of the season.
There ok to practice with but just no "official" use.
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