Star Mark Everlasting Treat Dispensing Chew Ball for dogs can be filled with flavor treats, (Starmark Pro Training Treats or Interlocking Treats) dog food, or anything your dog enjoys to snack on. Use it at meal time for interactive feeding fun. Bright green ball will provide hours of play time for your pooch. It stops boredom with hours of interactive play. The virtually indestructible ball is completely free of latex, vinyl and phthalates. The 1" X 1" opening allows you to fill the ball with almost any treat your dog desires.