Bar magnets, 3" Alnico I, 2/pkTwo 3" medium-strength Alnico I bar magnets with ends marked North and South. Alnico bar magnets (made from an aluminum nickel cobalt alloy) work well for most magnetism science projects.
The 3" Alnico bar magnets available fully meet Consumer Product Safety Commission standards.
WARNING: CHOKING HAZARD - Small parts. Not for children under 3 yrs.