Universal microwave oven parts: our waveguide cover works with all ovens and is cut-to-fit mica, can effectively protect sensitive electronic components; Notice: if the waveguide cracks you should not use your microwave until it's replaced Function: the mica plates sheets aimed to send radiation from the magnetron to the cooking chamber, to prevent food particles, steam and vapor from entering the space behind the cooking chamber where the electronic components of your microwave are located, protect the microwave oven from burning and last the lifetime of the microwave Quality material: constructed of mica sheet, very thick and durable, usually housed inside of the cavity on the right wall, or upper wall of the oven cavity, a practical and replacement part for the or old and is applied to cover the microwave Cut to size: each mica plates sheet measures approx. 108 mm x 99 mm/ 4.26 x 3.9 inch (does not contain 4 corners), you can use scissors to cut the size of your microwave oven, convenient for replacement Package includes: comes with 12 pieces of waveguide covers in one pack, sufficient for you to replace the microwave oven and other household appliances colour:Photo Color Material:Mica slice Package Contents: 12 * Mica Plates Only the above package content, other products are not included. Note: Light shooting and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.