Each pack comes with 12 cute decompression bouncing balls at random, you can choose to express your emotions according to your mood. These decompression balls have a diameter of 6 cm and random expressions, with angry, happy, fierce and funny faces.The material of the stress ball is PU polyurethane. And it is soft and elastic, can be squeezed freely to relieve your feelings. Our stress balls are available in a variety of styles, you can choose to express your emotions according to your mood.These balls are ideal for relieving negative emotions and freeing tense fingers.These decompression balls can improve blood circulation, stimulate the nerves of the hands and strengthen the muscles of the wrist and hand. Our fun balls help improve toddlers' focus and concentration.VARIETY AND RANDOM SUITABLE SIZE SOFT AND BOUNCY Physical and mental pleasure Relieve stress Improve blood circulation Improve concentration