Single use instant cold pack. Activates easily to provide instant relief. Provides an anesthetic effect which relieves aches and pains. Active Ingredients: Urea, Water. The cold pack measures 4"" x 5"" and is packed in a unitized box refill that fits well into first aid kits. Sold as unit of 1. Perfect for standalone first aid or as a refill for a kit. Cold Pack, 4" x 5", 1 Per Box 21-004-001