Check the listing for details. FIRST AID ONLY 21-004 Cold Pack,4"L x 5"W 39P018. Color: White, Condition: New. Listed at 2.12 USD. Cold Pack, Temperature Pack Length 4 in, Temperature Pack Width 5 in, Temperature Pack Thickness 1 in, Temperature Pack Material Plastic, Includes Fastener No Fastener, Latex Content Latex Free, Unitized Unitized, Compatible Manufacturer Part Number 239-AN, 241-AN, 242-AN, 243-AN, 249-O/P, 260-U/FAO, 5201, 5499, 6100, 6430, 90029, 90568, 90569, 90570, 90573, 90577, 90600, 90601, 90700, 90701, 90758, 90929, Reusable Disposable, Temperature Pack Color White, Activation Mechanism Instant Activate this Pac-Kit(R) Instant Cold Pack 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 s.