This bottle contains 250g of coarse 20-mesh iron filings in a translucent plastic bottle with a screw-on cap for easy dispensing. Iron filings are used in magnetism demonstrations, allowing students to visualize magnetic field patterns by sprinkling filings around magnets. The filings support a wide variety of hands-on experiments exploring magnetic field strength, polarity, and shape. Made from high-quality iron aggregate manufactured in the United States. Includes a GHS-compliant safety label. Not suitable for children under 8 years. Wash hands after use.