Imprint Option: 2 Day Rush - Sometimes, life can get pretty painful. Soothe your aches with this square shaped hot/cold packs. Filled with vibrant color gel beads, our packs can be used as both a hot and cold compress. Easy to use, this item moves seamlessly from freezer to microwave and can be used again and again. Our TekBeads are filled with a non-toxic, pliable blend of water and glycerin. Instructions for use are printed on the back of each item. Great for Nurse's Offices, workplaces, home, etc. Please note that the clear packs may have a yellow tint due to the temperature/chemical reaction.