KONG Fill or Freeze Tray makes it easy to fill, chill and freeze a KONG toy so you’ll always have one ready when it’s time for tasty, chewy, instinct-satisfying enrichment. A specially shaped holder has unique silicon flaps that hold a KONG securely upright for mess-free stuffing. Made for all sizes of Classic, Puppy, Extreme and Senior KONG toys. A specially shaped holder has unique silicon flaps that hold a KONG securely upright for mess-free stuffing. Made for all sizes of Classic, Puppy, Extreme and Senior KONG toys.