The MD140-250 from Withwave is a Microwave Absorber with Frequency DC to 24 GHz, Thickness 0.1 Inch/2.5 mm, Thickness 0.1 Inch, Thickness (mm) 2.5 mm, Resistance 1 x 10^6 Ohms. Tags: Cavity Resonance Absorber. More details for MD140-250 can be seen below.