The ABS-NBE from ABS Technics is a Microwave Absorber with Frequency 1 to 26 GHz, Attenuation -20 dB(Reflectivity level), Thickness 0.03 to 0.15 Inch / 1 to 4 mm, Thickness 0.03 to 0.15 Inch, Thickness (mm) 1 to 4 mm. Tags: Tuned Frequency Absorber. More details for ABS-NBE can be seen below.