The AEC-4 from Microwave Vision Group is a Microwave Absorber with Absorption 25 dB @ 3.0 GHz, 30 dB @ 6.0 GHz, 40 dB @ 10.0 GHz, 45 dB @ 15.0 GHz, 50 dB @ 30.0 GHz, Thickness 4 Inch/101.6 mm, Thickness 4 Inch, Thickness (mm) 101.6 mm, Weight 2.75 lbs (1.2 Kg). More details for AEC-4 can be seen below.