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The green future of METRA Building passes through low-carbon alloys: METRA RE.AL.E, produced by METRA in its Brescia headquarters. The name combines the prefix RE (recycle) with the suffix AL (aluminium) and the letter E (extrusion).METRA RE.AL.E low carbon alloys allow a configuration that comes in 5 proposals as showed in the table.The recycled aluminium used to produce the RE.AL.E C1 - C2 - C3 - C4 alloys are made up of aluminium scrapped during the production processes that take place within Metras plants. Instead, as regards the RE.AL.E. C5 scenario, a part of the aluminium (primary and secondary) used to make the alloy arrives as an ingot already processed by a supplier, as shown in the table.