The Nordic Ware 45339 Set contains a 9 x 13" natural cake pan, a 9 x 13" natural quarter sheet pan and one plastic cover which will fit both pieces. Made of even-heating rust-proof aluminum. Made of natural aluminum for even heat distribution, this pan has a reinforced rim around edging to enhance sturdiness and durability. NSF approved, which means it is approved for the heavy commercial use. Lids also fits other Nordic Ware Pans within the Naturals line. Made in the USA by the creators of the Bundt Pan, Nordic Ware.