Layers: Double Side Panel: FR4 Operating Temperature: Up to 140 °C or 285°F The item may have few fingerprints, you can clean by super-fine steel-wool, Restore4 , Tarn-X, Scotchbrite, Zap! or similar before using. After that be sure to rinse and dry so without any water spot. Thickness:1.5mm Size: Optional Quantity: Optional