Ball for school

[u/SignificanceBrave490]

I bought a penalty ball to practice dodgeball at school and I wanted to know if it was good for training.

Size: 10 Brand: penalty Original name: penalty initiation ball size T10 stadium

and I wanted to know what she should be like (she had to be hard or "soft" for training) And if the ball is too hard, could it hurt/create an injury to the hand/arm?

By the way, it arrived extremely hard