Nstakool instant cold Pack delivers immediate cold therapy for first aid, providing comfort and reducing swelling after an injury. This revolutionary formula is the first instant cold Pack with national security and safety in mind. Installer is a Urea based formula that is ammonium nitrate-free and rivals the temperature ranges of previous cold packs. Exceeds American National Standard - Minimum requirements for workplace first Aid Kits (ANSI Z30). install is a safer and hazmat free instruction.