Sterno 70334 SpeedHeat Flameless Food Warming System Refill ends the problem with locations that are strong against heating systems that use flames and does not have easy access to electricity. Includes 8 reusable trays that can hold 2 SpeedHeat Packets at a time and include 16 SpeedHeat Packets. The SpeedHeat Packets works instant when water is added and will last up to 45 minutes if not in an extreme cold environment. Advisable to use the Sterno SpeedHeat together to ensure proper usage and to avoid injuries. The base trays are recyclable and dispose the packets once they are no longer emitting heat. - Sold per case; 8 Trays; 16 Heat Packs