Sil-Eco professional grade aluminum quarter size baking sheet has an encapsulated steel rim to prevent warping and add strength to the pan. The aluminum pan will never rust and continues to promote even baking and browning. Even heat distribution allows you baked perfection every time. For easy clean up use pans with coordinating Sil-Eco non-stick, quarter size baking liners. Measures 9 by 13-Inch.