COLOR-CHANGING : When you squeeze the balls,magic thing will happen:Yellow becomes orange Blue becomes purple Green becomes yellow Red becomes purple STRESS RELIEF : Feeling stressed and on edge? Just squeeze it. This stress ball will sooth your soul and get you feeling peace fast.Effectively relieve your stress and anxiety of long hours of work and study. SUPER VALUABLE PACKS : The pack come with 4 balls with different colors:yellow,blue,green and red.Each one measures about 2.5 inches in diameter.More color and bigger than others. SAFE&HIGH QUALITY : These stress-relieving balls made of soft durable rubber, filled with ECO-friendly gel,and latex-like for long-term fun use.Cleans easily with soap and water. BEST GIFT : The colorful soft sensory stress ball will be fashionable for Teens Birthday gifts, Easter basket, Halloween,Christmas stocking stuffers, Children's day novelty gifts, office toys and more It is also suitable for children's party,which keeps the active body busy all day. Your child can get through the challenges of healthy games and sports in novelty toy.