Grabber Ultra Warmers are warm packs designed for "Maximum Duration"! Perfect for shipping temperature-sensitive materials by providing over 24 hours of all-day warmth. When the Ultra Warmer has done its job, just throw it away. Great for construction sites or for taking the chill off in a cold warehouse environment.Product Specifics: • Great for shipping tropical plants, fish and medical supplies• Dry, clean, odorless• Non-toxic and non-flammable• Average Temp: 124 degrees (F) • Max Temp: 149 degrees (F) Minimum order 1x box. Box has 30 packages.