Features: 1 set of 2 cooling packs.PCM is non-flammable and non-combustible.To activate, place cooling packs in freezer or soak in ice water for up to 1 hour until solid throughout.Cooling effects last for up to 3 hours.Reusable Specs: Phase Change Cool Pack Set- 2 Packs Per Set Case Quantity: 10 Case Length: 37 Case Width: 37 Case Height: 37