Craft Foam Balls

I need smaller styrofoam balls than the 0.8 size... Do you sell any smaller ones?

Would we be able to color on these with crayons or markers? Need for a birthday party craft activity and don’t want to use paint.

Are the 1.25 inch balls 1.25 inches in diameter or circumfrence?

Are the 2" balls actually 2" in diameter? I have ordered 2" balls from other manufacturers and they are only 1 3/4" or 1 7/8" in diameter. Thanks.