The 3660-P-300 from Holland Shielding Systems is a Microwave Absorber with Absorption 11 to 21 dB, Frequency 30 MHz to 18 GHz, Power 1.5 kW, Thickness 11.81 Inch/300 mm, Thickness 11.81 Inch. Tags: Pyramid, Foam Absorber, Hybrid Absorber, EMC Absorber. More details for 3660-P-300 can be seen below.