All of our dimensions are NOMINAL. There is a tolerance of (+/-)1/8" PETG is a thermoplastic sheet used in engineering applications. PETG offers the capability to produce complex shapes, precise details, deep draws and compound curves without worrying about durability. It's easily formed, die-cut and punched. It brings increased design freedom and lower fabrication costs. In sheet form, PETG has the impact strength and fabrication ease that acrylic can't touch. It offers high impact strength, good clarity, and is easily formed, punched and fabricated.