PETSPORTHappy Birthday Tuff Balls1.8 4-pack4 colorsTuff Balls, the original tennis ball for dogs, now comes in a Jr. Happy Birthday theme, flavored with fresh vanilla and smell just like a birthday cake!! Tuff Balls have extra-thick natural rubber walls which give added durability and bounce. A great cure for boredom and aggressive chewers.4 colors.4 balls per pack.Non-abrasive polyester felt - wont wear down teeth.Certified Non-toxic.Colorfast.Conforms to US and European child toy safety standards (CPSIA, ASTM-F963, EN-71).