The 3660-T-305 from Holland Shielding Systems is a Microwave Absorber with Absorption 11 to 25 dB, Frequency 30 MHz to 18 GHz, Power 1.5 kW, Thickness 2.83 inch/72 mm, Thickness 2.83 inch. Tags: Pyramid, Foam Absorber, Hybrid Absorber, EMC Absorber. More details for 3660-T-305 can be seen below.