|-
| style="width:30px;" | [[File:pec_group_icon.png]]
| style="width:150px;" | [[Glossary of EM.Cube's Materials , Sources, Devices & Other Physical Object Types#Perfect Electric Conductor (PEC) |Perfect Electric Conductor (PEC)]]
| style="width:300px;" | Modeling perfect metals
| style="width:250px;" | Solid, surface and curve objects
|-
| style="width:30px;" | [[File:thin_group_icon.png]]
| style="width:150px;" | [[Glossary of EM.Cube's Materials , Sources, Devices & Other Physical Object Types#Thin Wire |Thin Wire]]
| style="width:300px;" | Modeling wire radiators
| style="width:250px;" | Curve objects
|-
| style="width:30px;" | [[File:diel_group_icon.png]]
| style="width:150px;" | [[Glossary of EM.Cube's Materials , Sources, Devices & Other Physical Object Types#Dielectric Material |Dielectric Material]]
| style="width:300px;" | Modeling any homogeneous material
| style="width:250px;" | Solid objects
|}
Click on each category to learn more details about it in the [[Glossary of EM.Cube's Materials , Sources, Devices & Other Physical Object Types]].
Both of [[EM.Libera]]'s two simulation engines, Wire MoM and Surface MoM, can handle metallic structures. You define wires under '''Thin Wire''' groups and surface and volumetric metal objects under '''PEC Objects'''. In other words, you can draw lines, polylines and other curve objects as thin wires, which have a radius parameters expressed in project units. All types of solid and surface CAD objects can be drawn in a PEC group. Only solid CAD objects can be drawn under '''Dielectric Objects'''.