Nordic Ware - Insulated Cookie Slider Sheet Popular with many home bakers, this pan has a cushion of air between two layers of aluminum. The added insulation is insurance against over-browned cookie bottoms and overdone pizza crusts, especially in ovens with hot spots. Get perfectly browned results. Quantity: 4 Aluminum Interior Dimensions: 12.96"L x 16"W x 1"H Lifetime Warranty Made in the USA Use & Care: 1. Before initial use and after subsequent uses, hand wash with warm, soapy water. Not recommended for dishwasher use, as discoloration will occur but will not affect baking properties. 2. Season pan with a solid or spray vegetable shortening before each baking use or line with parchment paper. 3. Scouring pads and metal utensils may scratch pan, but will not affect baking performance. 4. Aluminum is reactive to the acids in certain foods such as vinegar and tomato products which may darken, pit or corrode the pan.