6 metal ceiling systems, namely suspended ceilings, open cell ceilings, parallel beam ceiling, linear baffle ceilings, all principally comprised of metal runners, suspension wires, cross-tees, and metal perimeter treatments; drywall ceiling systems for attaching drywall panels comprised of metal runners, metal cross-tees, metal furring tees, and metal drywall channels; metal ceiling components, namely panels, beams, cross-tees, runners, and metal ceiling accessories, namely wall moldings, wall angles, drywall tracks, and corner caps