My friend has made both the corn and the rice kind. I like to use the larger corn ones around my neck for sore muscles/sore throat, and the smaller rice ones for my bad sinus/toothache days. When I can't find one and I'm really hurting, I pull out a longer missing mate sock, dump some rice in, tie the end and microwave! Pretty sure they won't sell well, but they do work. I may be mistaken, but I thought she said she bought cracked corn at the feed store?