The soft balls are made of quality PU foam, which is safe and reliable, owning soft and comfy tactility, not easy to break or tear, can be applied for a long time, the mini stress balls can be applied to relieve your stress and anxiety, keep you calm down and focus, improving your studying and working efficiency, these foam sports balls are suitable as baseball party favors, gift bag fillers, game prizes, classroom rewards, carnival prizes, etc., offering you much fun.