The 3650-5-CF from Holland Shielding Systems is a Microwave Absorber with Absorption 5 to 15 dB, Frequency 1 to 18 GHz, Thickness 0.19 Inch/5 mm, Thickness 0.19 Inch, Thickness (mm) 5 mm. Tags: Foam Absorber. More details for 3650-5-CF can be seen below.