This is a nonstick steel muffin/cupcake pan.
It measures 13 7/8" x 10 9/16".
Each of the twelve cups is 2 5/8" in diameter at the top and 1" deep.
This pan is made of heavy gauge (thickness) steel.
It is lightly used, clean, and in very good condition.
There is no brand indicated on it, but it's probably a Cuisinart.