A tooling assembly, including a cermet tooling body and a plastic support structure operationally connected to the cermet tooling body. The plastic support structure at least partially encapsulates the cermet tooling body. The plastic support structure includes a plastic matrix portion and a plurality of high magnetic permeability metallic particles distributed throughout the plastic matrix portion. Each respective high magnetic permeability metallic particle has a magnetic permeability of at least 0.0001 H/m and each respective high magnetic permeability metallic particle has a relative magnetic permeability of about 8000. The plastic matrix portion is selected from the group consisting of high molecular mass polymers, thermoplastics, thermosetting polymers, amorphous plastics, crystalline plastics, resin-based materials, and combinations thereof.