The 3690-1000 from Holland Shielding Systems is a Microwave Absorber with Absorption 11 to 50 dB, Frequency 80 MHz to 100 GHz, Power 5 kW, Thickness 39.37 Inch/1000 mm, Thickness 39.37 Inch. Tags: Pyramid, Power Absorber. More details for 3690-1000 can be seen below.