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Its design allows air to circulate freely around the cookies so they bake and brown evenly. A jelly-roll pan (either 15 Â½ by 10 Â½ inches or 18 by 12 a.k.a. a half-sheet pan) has 1-inch-high sides and is perfect for making cake rolls; it can stand in for a cookie sheet in a pinch. It's also a terrific roasting pan for veggies and more.
Professional sheet pans used in commercial kitchens typically are made of aluminum, with a 1 in (2.5 cm) raised lip around the edge, and in the United States come in standard sizes. The full-size sheet pan is 26 by 18 in (66 by 46 cm), which is too large for most home ovens. A two thirds sheet pan (also referred to as a three quarter size sheet pan) is 21 by 15 in (53 by 38 cm). A half sheet pan is 18 by 13 in (46 by 33 cm); quarter sheets are 9 by 13 in (23 by 33 cm). The half sheet is approximately the same size as mass-market baking sheets found in supermarkets, and the quarter sheet is a common size for rectangular, single-layer cakes.