The 5780-C3 from Holland Shielding Systems is a Microwave Absorber with Frequency 1 MHz to 18 GHz, Thickness 0.009/0.01/0.02 Inch/0.25/0.50/0.75 mm, Thickness 0.009 / 0.01 / 0.02 Inch, Thickness (mm) 0.25 / 0.50 / 0.75 mm, Magnetic Permiablitity 50 µ’. Tags: EMI Absorber. More details for 5780-C3 can be seen below.