500 inches (about 40 feet) Magnesium metal strip, weighing 25 - 29 grams, formed in a roll. This magnesium ribbon is about 3 mm wide and 0.03mm thick. For combustion experiments.

Flammable solid.
Available in MiniScience brand (High quality, smooth surface and edges, easy to start ignition) and India brand (Takes more heat to ignite, some filings and roughness in edges or surface, lower price).