2 Different Resistance Stress Relief Balls- The resistance levels of two stress balls include: Grey(soft); Pink(hard), so you can choose the right one for your different needs.Safe and Durable Materials- The outer material is made of tear-resistant fabric, which makes the Soft squishy balls more durable. Inside of the balls are made of silicone gel. It dont have strong rubbery odor, theyre lightweight and reusable.Comfortable Touch- The stress balls are 2.3inch(5.8 cm) in diameter, a little bigger than an egg. This is a really nice size for you to squeeze it with a comfortable touch or convenient to take it in your pocket.Relieve Tension and StressYou could put a stress ball in your office or home, and play with it when you feel anxious, nervous or discomfort. They will be good toys to relieve the stress and smooth the mind. Perfect fidget stress ball for adults.Great GiftIf you have friends who use the keyboard and mouse all day. Their hands probably will get quite sore. Exercise hands with these grip strength trainer balls will definitely solve the issue