When you want to keep things cold without the moisture other ice packs make, this viscous gel moisture safe refrigerant cold pack is exactly what you need. Ice-Brix is a specially formulated leakproof, long lasting, viscous gel refrigerant that is made with non-toxic ingredients included in the FDA (GRAS) provision. Generally regarded as a safe substitute. They keep perishable products at a constant and desirable temperature. Thery were rated "Best in all aspects". Their unique feature includes long lasting cold, efficient transfer of energy, reusable and economical.Moisture Safe film pouches reduce condensation during the humid months, products arrive dry. Moisture safe bag style. 6-1/2" x 4" x 3/4".P T