The Full Metal Staff is a low-ranked weapon for Aeris and provides 22 Attack, 100 Attack%, 4 Magic, and 1 linked materia slot and 1 unlinked materia slot. It can be bought for 800 gil in Kalm or Junon (disc 1).
The Full Metal Staff is a level 3 rod that provides +62 HP, +3 Attack, +1 Defense, and Magic Damage +10%. It can be obtained from the shop by trading 1,000 gil, Rod, Recovery Shard, and Transmogridust x2.
The Full Metal Rod is a level 1 rod that provides +231 HP, -52 Bravery, +22 Attack, +2 Defense, and Magic Damage +3%. It can be obtained from the shop by trading 15,420 gil, Rod, and Glass Beads.