Our hand grip balls are created with a premium sponge material that is non-toxic. These Stress Balls are tear and split resistant, they don not easily break open or change shape even after constant use. Repeatedly squeezing a stress ball can help release tension, relieve stress and improve focus and concentration, so the stress relief balls are suitable for people of any age. Children who have autism or ADD/ADHD can use the stress balls as a way to keep calm and stay focused. Our hand therapy balls for adults will enhance your focus and concentration as well as increase your muscle agility and flexibility. Quantity over 7000 ship by sea.