The 5780-C1 from Holland Shielding Systems is a Microwave Absorber with Frequency 1 MHz to 18 GHz, Thickness 0.0047/0.007/0.009/0.01/0.01/0.023/0.03/0.059/0.0787/0.0984 Inch/0.12/0.20/0.25/0.33/0.50/0.6/1.0/1.5/ 2.0/2.5 mm, Thickness 0.0047 / 0.007 / 0.009 / 0.01 / 0.01 / 0.023 / 0.03 / 0.059 / 0.0787 / 0.0984 Inch, Thickness (mm) 0.12/0.20/0.25/0.33/0.50/0.6/1.0/1.5/ 2.0/2.5 mm, Magnetic Permiablitity 25 µ’. Tags: EMI Absorber. More details for 5780-C1 can be seen below.