A Toronto school has banned hard balls, such as basketballs, volleyballs, soccer balls, and even tennis balls in the name of safety.

As of November 14, students at Earl Betty Jr. and Sr. Public school in East York are now only allowed to bring Nerf and sponge balls to school.

In a letter sent home to parents, any hard balls “will be confiscated and may be retrieved by parents from the office.”

The ban was issued after a parent suffered a concussion after getting hit in the head with a soccer ball.

With files from the Toronto Star