5 inch x 2 3/4 inch x 3/4 inch - 3 oz. Ice-brix cold packs. Keep perishables at a constant and desirable temperature for days or extend your shipping times. The ultimate in refrigerant packs. Leak proof, reusable and economical to use. Specially formulated with food safe, non-toxic materials that stay colder than ice. Tested and shown to be the coldest and best gel refrigerant available.