This is a handmade rice/flax seed bag that can be warmed up in the microwave for moist heat or put in the freezer. This wrap is about 20" x 5". It is segmented to help keep the rice more in place. The average heating time is 1-3min but can vary depending on the microwave. You can also warm up your bag in the oven at 325 for about 20min. Check it often during the warming process and shift it around so the rice can be evenly heated. Overheating can result in a burn so please be careful. When placing your bag in the freezer I recommend that they are put in a plastic bag to prevent the freezer smell from attaching to the fabric. Rice bags release moist heat that helps to aide with circulation and pain relief to sore muscles and joints. As your bag cools down, the heat becomes even more penetrating. The heat helps dilate blood vessels and increases the flow of oxygen and nutrients to help heal damaged tissue. It also decrease the transmission of pain signals to the brain and helps relieve discomfort. When used as a cold pack it works by reducing blood flow to a particular area which can significantly reduce inflammation and swelling that cause pain. These bags help with strains, migraines, joint pain, inflammation, PMS, anxiety and depression, fibromyalgia, and post surgery and injection recovery. I can also scent your bag with essential oils.  I have tons to choose from. some of them are lavender, lavender/chamomile, peppermint, eucalyptus, rose, jasmine, spiritual, sleep ease, energizing, and serenity. You can combine any of the scents.If you want it scented please message me when ordering. I will take special orders and do bulk pricing. Please make sure to subscribe to my Ebay store to get updates on new listings. Also follow me and like me on Facebook at Serenity Journey Crafts