The MF500F from Emerson & Cuming Microwave Products, Inc. is a Microwave Absorber with Frequency 1 to 18 GHz, Thickness 0.125" to 3.0", 3.2 to 76.2 mm, Thickness (Inch) 0.125" to 3.0", Thickness (mm) 3.2 to 76.2 mm. Tags: Load Absorber. More details for MF500F can be seen below.