The 3680-690 from Holland Shielding Systems is a Microwave Absorber with Absorption 8 to 50 dB, Frequency 30 MHz to 100 GHz, Power 5 kW, Thickness 27.16 Inch/690 mm, Thickness 27.16 Inch. Tags: Pyramid, Power Absorber. More details for 3680-690 can be seen below.