Material culture is the study of stuff (material) in history. Stuff - the objects, artifacts, tools and artistic creations of people. It is the study of how stuff is used and what it means to people in history, and the impact of stuff on history. It is the study of how stuff embodies the culture that created it - the culture's beliefs, technology, social organization and economic structure. It covers all kinds of stuff - weapons and armour, clothing, furniture, art, personal items like combs and mirrors, books (the physical objects and the way that influences the text written on them).
So. Ask about stuff!
What impact did steel had on the organization, battle tactics and equipment of armies?