Ice Brick&trade; Shipping Pack, 4" x 6", 8 ounces - 72/Case Ice Brick Shipping Pack by Nortech Laboratories is a water-based gel refrigerant that was specifically designed and engineered for COLD transport of shipping heat sensitive products. Designed as a safer alternative to dry ice. Ice Bricks are great for cold transport pharmaceuticals, vaccines, medicines, chocolates, meats and other perishable products. Stays colder longer. Reusable.