Please be as specific as possible when letting us know what is missing or incorrect. For example, say "this game's trophy difficulty should be 8/10", with a link to a website corroborating this difficulty estimate (if possible), not "this game's trophy difficulty is wrong".
The Yakuza: Like a Dragon Crafting Mat Set includes Materials Pack: Common, Materials Pack: Uncommon, and Materials Pack: Rare. These materials can be used to craft in-game items and equipment at the Romance Workshop in Yokohama.
Materials Pack: Common includes: Quality Lumber x20 High Quality Lumber x20 Sturdy Iron x20 Refined Iron x20 High-Purity Lead x20 Tempered Steel x20 Immaculate Pane x20 Tempered Glass x20 Dull Aluminum x20 Gleaming Aluminum x20 Smooth Hide x20 High-End Leather x20 Beautiful Cloth x20