The Cooking Tray is an OEM part for GE microwaves. This tray sits on the turntable in the microwave and holds the food items being heated or cooked, allowing for even rotation and uniform cooking. Causes of a bad cooking tray can include cracks or breaks from heavy use, exposure to extreme temperatures, or accidental drops.   Symptoms of a bad cooking tray include: Cracks or chips on the tray Difficulty in rotating or the tray not rotating at all Unstable placement of food items Uneven cooking results This OEM GE part is also compatible with Hotpoint, RCA, and some Kenmore models.WB49X10129 (AP3793663) replaces WB49X10225, 1087512, 1B71961A, AH956214, EA956214, PS956214, WB49X10061, WB49X10067, WB49X10074, WR49X10074.