Bar Magnets, #K035:  Shipped in pairs, with end keepers. These powerful magnets are painted with North and South poles clearly marked. Width 1/2", Thickness 1/4", 3" Long Horseshoe Magnets, #K030: Strong steel magnets, zinc-plated with North and South poles marked. Supplied with keeper.  Supplied with keeper, 4" Long. Horseshoe Magnet, #K032: Strong steel magnets, zinc-plated with North and South poles marked. Supplied with keeper. Supplied with keeper,  6" Long.