High Quality :Made of PPS material, temperature resistant,durable and have a long life-span | Size of Microwave turntable ring: Outer diamater 8.7inch(22.1cm),Inner diamater 8.18''(20.8cm)for the diameter of the innermost plastic edge, wheels are 1.45cm/0.57'' tall | Performance: Great repairing for your old one,make your microwave oven like new | Package : 2 Pieces Microwave Oven Plate Tray Rotating Ring;suit for above 11.8 Inch/30cm Plate Tray