The 5790-ES12 from Holland Shielding Systems is a Microwave Absorber with Frequency 10 MHz to 6 GHz, Thickness 0.003 Inch/0.1 mm, Thickness 0.003 Inch, Thickness (mm) 0.1 mm, Magnetic Permiablitity 60 ± 5. Tags: EMI Absorber. More details for 5790-ES12 can be seen below.