Made with rice and lentils,  These shoulder shoulder with packs can be used in the microwave or in the freezer as an icy hot bag. Enhance them with a few drops of your favorite essential oil, and the centuries old medicine bag does its thing. Great for shoulders kneecaps, lower backs, and more. Doubling as a cold pack, the smooth cold beads inside are great for hot flashes, little ones, and August summers. I have several different colors and patterns. So, if you order this, please reach out with a favorite color or color pattern.