I made a lot for Christmas gifts last year. My family has asked for more. So far none has burned using cotton flannel as batting, cotton thread and cotton fabric. Do not use batting that has scrim which will catch on fire. I bought the batting made for microwaves this year to be extra sure. I have several sets to make for friends. By the way layer cakes are perfect for these. You can get 20 - 22 from one package.