Mica are used to food from splashing water or oil onto the magnetron tube during heating.The insulation, the mica chip in the microwave oven is designed to the magnetron emits the microwave working properly, which can extend life.The mica piece is brittle and easy to break, so do not overbend.Clean mica cover regularly, keep clean, dry and oil-free, and replace polluted mica pieces in time.package contains 10pcs mica to meet daily replacement.colour:Photo ColorMaterial:Mica size:64x107mmPackage Contents:10 * Mica FoilOnly the above package content, other products are not included.Note: Light and different displays may the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.