The 3640-700 from Holland Shielding Systems is a Microwave Absorber with Absorption 8 to 50 dB, Frequency 30 MHz to 110 GHz, Power 1.5 kW, Thickness 27.55 Inch/700 mm, Thickness 27.55 Inch. Tags: Ferrite, Pyramid, Foam Absorber. More details for 3640-700 can be seen below.