The AEC-4/6-12T-MM from Microwave Vision Group is a Microwave Absorber with Absorption - 35 dB @ 12-40 GHz, Weight 2.6 lbs (1.2 Kg), Operating Temperature 70 Degrees F +/- 10 Degrees (21 Degrees C +/- 3 Degrees). Tags: Millimeter Wave Absorber. More details for AEC-4/6-12T-MM can be seen below.