The AEC-4/5-8T-MM from Microwave Vision Group is a Microwave Absorber with Absorption - 35 dB @ 12-40 GHz, Weight 1.9 lbs (0.9 Kg), Operating Temperature 70 Degrees F +/- 10 Degrees (21 Degrees C +/- 3 Degrees). Tags: Millimeter Wave Absorber. More details for AEC-4/5-8T-MM can be seen below.