A stack of Efficient Mechanical Parts!
Efficient Mechanical Parts are a crafting material. Can naturally be looted from toolboxes, crates/boxes, and any mechanical object. Efficient Mechanical Parts alternatively can be found from destroying mechanical objects in high end Twine Peaks. They are used to craft Tier 5 weapons.
After purchase don't forget to open up a live chat to collect your items. You can do this in the bottom right corner of any page.