Carbon steel with patented non-stick coating. Won't chip or peel. Dimensions: 14L x 11W x 1.25H in.. The markings allow you to line up the slicer and cut any portion or size. Dishwasher safe. Limited lifetime warranty. When cutting technique is the only improvement your bar cookie recipes need, turn to the BergHOFF Perfect Slice 2211615 14 x 11 in. Cookie Sheet with Tool. With this set, you can turn out platters of perfectly sized bar cookies every time, and in record time, too! The cookie sheet's edges are marked with guidelines, so you can simply line up the PerfectSlice cutting tool and press down for neat, clean lines every time. PerfectSlice is an amazing technology for those who are watching their portion sizes, but it's also great for entertaining, and it's just plain fun to use! Both the silicone-handled cutter and the non-stick cookie sheet are dishwasher safe.