The MR11-0002-20 from MAST Technologies is a Microwave Absorber with Frequency 2.0 GHz, Thickness 0.13 Inch/3.3 mm, Thickness 0.13 Inch, Thickness (mm) 3.3 mm, Operating Temperature -60 Degrees F to 375 Degrees F. Tags: Tuned Frequency Absorber. More details for MR11-0002-20 can be seen below.