I was very disappoint with this product. I was so busy over the holidays to take the time to send it back or ask for a replacement. This was not a heavy-duty pan. It was very cheaply made and not worth the $9.99 price. I could easily make a dent imprint with my finger just by lightly pressing down on the inside of one of the muffin circle. I went on and used it because I needed it with the amount of baking I was doing. I actually have a heavy-duty Wilson 24-Cup Mini Muffin Pan and this Norpro pan is not of the quality of the Wilson pan. I was thinking maybe they put the heavy-duty Norpro label on the wrong pan - there was nothing heavy-duty about it.