How are materials distributed from material packs?

For example, when you open a 100 Titanium guaranteed 1000-piece Material Pack, the guaranteed 100 Titanium is given first.

The remaining 900 materials are then distributed based on element weight (rarity/probability) — not equally.

The system distributes materials according to each element’s weight in the game.

If 100 Titanium were not guaranteed, you would receive much less Titanium due to its lower weight.

This same weight logic is also applied in weapon upgrades.