Scrap are the items that are only for the Workshop. You can unlock custom vehicle parts  when you have 80, 160, 320 and 3000 (only for the alien Workshop ) to get custom skins and abilities (only with alien items) for your Vehicle Parts. If you get a loot crate and you have that skin, then you will get scrap which is 30, 55 and 110 depending on the part's rarity. if more than one skin is converted into scrap, it will stay at the same amount of scrap

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