Is Matter Conserved when Steel Wool Burns?

The IRON (Fe) in steel wool reacts with the OXYGEN (O2) in the air in a mesmerizing reaction that changes the mass in unexpected ways.
In this video:
Iron Wool Reaction with Oxygen
5 Types of Reaction
Evidences of Reaction
Isopropyl comparison to Steel Wool

Other Combustion Reactions
Why does fire put out fire? (Part 1)