These were a gift for my daughter who just moved away for college.  She loves to cook and enjoys Le Creuset cookware so I thought these would be a great gift for her.  I thought they would be the heavy aluminum like the cookware...I didn't read the description closely enough...I thought she could use them in the oven for ramekins, etc but, they are silicone which she's very happy with.  She likes that she can squeeze them for easy pouring.