rocks, steel scraps(10oz or more), glass, sharpened sticks, large bolts(10oz or more), sand mixed with alcohol(35proof or more), cans(filled with heavy materials, not food) bb's(steel, lead, brass,etc), sharpened bones, malatov, steak knives, metal spraycans, screws, ice shards,empty ammo casings, and silverware.Those are all I can think of.