The 3610-100-40 from Holland Shielding Systems is a Microwave Absorber with Absorption up to -37 dB, Frequency 30 MHz to 1 GHz, Thickness 0.157 inch/4 mm, Thickness 0.157 inch, Thickness (mm) 4 mm. Tags: Ferrite. More details for 3610-100-40 can be seen below.