This is a rice and flax seed heating/cooling neck wrap. It is about 30" x 6". You can also get a eye bag in this design. The eye bag is approximately 10" x 4". The eye bags are great for migraines, tension headaches, allergies, tired, sore eyes, and for fevers. If you want a smaller neck wrap you can get this in a 20" x 5" neck wrap and also you can get this in a 14" x 7" body pad. The smaller body pads are great for traveling or for small areas. It is segmented so the rice stays in place better. When warming up you will want to shift the rice around so the whole thing warms up or freezes. These are great for covering your whole back or stomach. 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 also can add essential oils to your bag for aromatherapy. I will take special orders and do bulk pricing. You can find me on Facebook at Serenity Journey Crafts.