Zirconium

Zirconium is an automotive company in GTA IV that produces vehicles such as:
 * Stratum

Other Manufacturers

 * Albany
 * Annis
 * Benefactor
 * Bravado
 * Brute
 * Classique
 * Declasse
 * Dinka
 * Dundreary
 * Emperor
 * Grotti
 * Invetero
 * Karin
 * Mammoth
 * MTL
 * Pegassi
 * Pfister
 * Schyster
 * Shitzu
 * Ubermacht
 * Vapid
 * Vulcar
 * Willard
 * Zirconium