The 3600 series from Holland Shielding Systems is a Microwave Absorber with Absorption 12 to 36 dB, Frequency 3.6 GHz, Thickness 0.26 Inch/6.7 mm, Thickness 0.26 Inch, Thickness (mm) 6.7 mm. Tags: Ferrite. More details for 3600 series can be seen below.