Go beyond standard iron filings! Get three different results in your STEAM magnetism experiments! Includes three jars, each with a different particle size of iron filings: FINE/100 mesh, MEDIUM/40 mesh, and COARSE/20 mesh. Each jar features a convenient, twist-top shaker lid with four options (sprinkle, sprinkle more, pour, or screw off the entire top). Reusable--put clean filings back into the jar. Each pack includes three jars (12 oz each of 100% pure iron) plus an activity sheet with 5 cool STEAM activities. Shrink wrapped to prevent spills in stores and shipping.