The FS-300 from ETS-Lindgren is a Microwave Absorber with Frequency 30 MHz to 40 GHz, Power 540 to 1000 V/m CW, Thickness 11.81 Inch/300 mm, Thickness 11.81 Inch, Thickness (mm) 300 mm. Tags: Ferrite, Pyramid, EMC Absorber. More details for FS-300 can be seen below.