These rice bags are amazing! They are stitched by Titus and ready to use. They can be used for heat or ice packs. Just put it in the microwave for 20 sec. and viola you have a toasty heat pack or in the freezer for an ice pack on those sore muscles or achy joints! And, they are reusable! We have had ours for several years and they are still going!! These are also great for little ones or anyone that has ear infections AND these are great for handwarmers! They typically last about an hour - two depending on the temperature outside before needing to reheat if in your pocket.