Small ice-cubed sized packets of refrigerant sealed between layers of durable, flexible plastic film. Refrigerates and cushions hard-to-ship samples. When pre-frozen to 16°F or lower, Insul-Ice™ keeps samples cold one-third longer than ice. Ideal for maintaining the desired temperature of an ice bath without diluting it. Reusable and washable. Fifty pound case contains either approximately 1500 individual packets or a sheet of packets.