In squash, which of these balls is considered to be the competition standard?

Used to keep the squash ball in my bra to warm it up on the way to the courts lol.

If you've ever been hit by a squash ball you know how fast they travel and how hard they are!!)

Squash is one of the most fun games/sports I’ve ever played.

Kiwozzie, happy birthday

Never played squash, but I have played racquetball.