Polar Tech IB16 Ice Brix refrigerant packs keep perishables at a constant temperature. The viscous gel refrigerant is non-toxic as listed by GRAS. The 16oz. pack is constructed of heavy-duty plastic to provide leakproof use, and is 6-1/4 x 6 x 1 inches (H x W x D, where H is height, the vertical distance from the lowest to highest point; W is width, the horizontal distance from left to right; D is depth, the horizontal distance from front to back). Includes 18 ice packs.