This is the replacement shelf insert for your refrigerator. It is made of glass and is approximately 11.69 inches by 11.37 inches. The shelf insert slides into the shelf trim and acts as a top for the crisper drawers, as well as a shelf to store food items. The main reason to replace the shelf insert, is if it is cracked or broken. To replace the shelf, simply slide the old shelf out, and remove the trim. Attach the trim to then new insert and slide it back into place. This is an authentic OEM part and it is sold individually.