it is the wax part(or soy, or whatever depending on what you buy) that sits in a warmer
http://www.chunkymonkeyboutique.com/...Yes&Thumbs=100
i use a tea light warmer like these but there are electric ones too
http://www.chunkymonkeyboutique.com/...Yes&Thumbs=100
here are some tarts :)
i HTH!