A shielding device configured to provide EMI or ESD protection to an electronic component (80) comprises a cover (83), and a wall (10) of a resilient material. By molding the resilient material under the influence of a magnetic field provided by a number of separate magnets, a dispersed plurality of magnetically attractable particles in the material are concentrated in strings (11) extending between a lower (12) and upper (13) end of the wall. The cover is attached to connect to the strings affixed in the solidified wall at the upper end of the wall, and at the lower end of the wall the strings are placed in contact with a ground trace (82) formed around the component to be shielded, thereby forming a Faraday cage about the component.