Toysmith IsoFlex Stress Balls Assorted Bundle - 3 Pack Bundle Includes 3 Assorted IsoFlex Stress Balls! (Colors are Assorted and Will Vary) Each ball measures 2-1/4" & is double lined for durability Helps relieve stress, pain and stiffness in the hand while enhancing flexibility and strength! Doctor recommended, squeeze and feel good! For Ages 8 and up