The 3680-190 from Holland Shielding Systems is a Microwave Absorber with Absorption 27 to 50 dB, Frequency 30 MHz to 100 GHz, Power 3 kW, Thickness 7.48 Inch/190 mm, Thickness 7.48 Inch. Tags: Pyramid, Power Absorber, Hollow Absorber. More details for 3680-190 can be seen below.