For therapeutic relief of muscle aches or pains. Maintains an even temperature over the entire pack. Leak-proof and contains no liquids or dyes. Biodegradable and contains only non-toxic ingredients. Reusable. Versatile freezer or microwave. Remains soft and pliable. Designed for 25 seconds in microwave- Gel Pack, Hot/ Cold, Junior, 4 " x 7", Reusable, 48/cs