The HT200-75 from Withwave is a Microwave Absorber with Frequency DC to 40 GHz, Thickness 0.03 Inch/0.75 mm, Thickness 0.03 Inch, Thickness (mm) 0.75 mm, Resistance 1 x 10^6 Ohms. Tags: Cavity Resonance Absorber. More details for HT200-75 can be seen below.