Pack of 2 mica waveguide covers for Sharp microwave ovens. 

Part number: PCOVPA419WREZ

Dimensions: 111mm x 118mm
Mica waveguide cover for Sharp microwave ovens.
If your microwave is arcing or sparking during cooking, it may be that the waveguide cover is damaged. This metallic type material, which is a blend of mica and is invisible to microwaves, it covers the aperture that the microwaves pass through to get into the oven cavity. When old damp or contaminated can react to microwaves by arcing.  

Fits: Sharp R-26STM microwave ovens,