The 3640-190 from Holland Shielding Systems is a Microwave Absorber with Absorption 27 to 50 dB, Frequency 30 MHz to 110 GHz, Power 1.5 kW, Thickness 7.48 Inch/190 mm, Thickness 7.48 Inch. Tags: Ferrite, Pyramid, Foam Absorber. More details for 3640-190 can be seen below.