Meet the Gel - the doctor-designed, drug free way to relieve pain and swelling. These packs do double duty as they use both heat and cold; cold to reduce swelling and inflammation, and heat for pain relief. It's a cure-all for trips, fall, sprains and strains at home, at the gym, or in the workplace. Just place in the refrigerator, freezer or microwave, and it's ready for use. Each item measures 4" in diameter, and comes in three colors. Add your business logo or message, and you've created the perfect giveaway for health fairs, first aid seminars, gyms, and yoga studios.