The 3680-1000 from Holland Shielding Systems is a Microwave Absorber with Absorption 11 to 50 dB, Frequency 30 MHz to 100 GHz, Power 5 kW, Thickness 6.29 inch/160 mm, Thickness 6.29 inch. Tags: Pyramid, Power Absorber, Hollow Absorber. More details for 3680-1000 can be seen below.