100 mm (4 inches) Bar Magnet 1 Pair (2 Pcs) Red & Blue Combined Color. This is 4 4-inch Bar Magnet, useful for student demonstrations, plotting magnetic fields, etc. Made from magnetic steel strips and made in India. This Magnet is painted Red/Blue and Stamped with N and S to indicate North and South Poles. Supplied in pairs with cardboard separators and plated soft iron keepers.