Each ball is the Same Size:ball diameter approx 2.48''. When the mood is not good, you can use these ball to vent. Best Toy For Any Party, Goody Bag Toy, Giveaway, Holiday gift, Gag Toy Etc. Very good pressure release appliance, also can be used as a toy for fun. Perfect gift for your friends, its fans or yourself to relax. Price includes one color logo printing.