The 3650-50-CF from Holland Shielding Systems is a Microwave Absorber with Absorption 10 to 22 dB, Frequency 1 to 18 GHz, Thickness 1.96 Inch/50 mm, Thickness 1.96 Inch, Thickness (mm) 50 mm. Tags: Foam Absorber. More details for 3650-50-CF can be seen below.