The MS35-230 from Withwave is a Microwave Absorber with Frequency DC to 18 GHz, Thickness 0.09 Inch/2.3 mm, Thickness 0.09 Inch, Thickness (mm) 2.3 mm, Resistance 1 x 10^6 Ohms. Tags: Cavity Resonance Absorber. More details for MS35-230 can be seen below.