The UD-11569-01 from ARC Technologies, Inc. is a Microwave Absorber with Frequency 5 GHz, Insertion Loss -8 dB, Thickness 0.050” ± .0.005”, 1.27mm ± 0.127mm, Thickness 0.050” ± .0.005”, Thickness (mm) 1.27mm ± 0.127mm. More details for UD-11569-01 can be seen below.