Woven sacs of rice. Pop one in the microwave for about 30 seconds and use on sore spots, cold spots, use it to help keep your soup warm. You get the idea. *Please trust your gut and your personal microwave experience for time here, start off with less time and work your way up* You can also keep one in the freezer for the occasional hot flashes, bumps, lumps, whatever life tosses your way that needs some cold comfort. Approximately 4 x 6 inches (10 x 16cm) backed with grey micro suede, fronted with woven cloth. You will receive the Sac o’ Rice pictured.