Material: Silicone materials make stress balls more soft , which was excellent tools for exercising and strengthening.PS: Do not rub them on rough surface or stab them with sharp objects ,like fingernails Anti-Stress Squeeze Balls: When the ball is squeezed, the balls peep out through the holes in the net, making it great for therapy and stress relief. The grape ball is a great gift for Easter, Christmas, Birthday, and party bag fillers to surprise your children, wife, husband, girlfriend, boyfriend, mother, father, or even grandparents. Fidget Toy Grape Ball: Squeeze the mesh squishy balls, it will change to grape. Each colorful stress balls with sparkled LED lights, the neon light will flash on impact. Anti-Stress ball is a great relaxing toy for those who use computers and exercise their hands regularly. It can strengthen the muscles of the hands, wrists, and forearms, which is ideal for release stress? rehabilitation, physical therapy Easy to clean:The fidget stress balls are not sticky, so they can keep your hands clean even after a long time of use. Greatly recommended to parents, therapists, students, and teachers, they can be used at home, school, and work. To restore clean, just wipe with a damp cloth or wash directly with water. Package included: 12-pack of colorful anti-stress balls with a gift box. It is best for a birthday, Halloween, Christmas, Easter gifts.