Disposable warmer is a truly portable heat pack that does not have to be plugged in and need no batteries, just air-activated to reach a safe preset temperature within minutes. It provides instant and continuous warmth and is great for not only daily body warm up, it is also perfect for outdoors activities and healthcare. Application: Hunting, Fishing, Golf, Hiking, Camping, Skiing, Working, Pain relief. Ingredient: Iron powder, water, salt, activated carbon etc. (environmentally friendly) Measurement: 125mm*170mm Weight: 45 g/piece Duration: 12 hours Max Tem: 144 F Ave Tem: 126 F Lead time: OEM 45 days, Non-OEM 25 days. Container factor: 190,000 piece/20GP; 380,000 piece/40GP