Shaw magnets alnico bar magnets shaw magnets aln040 shaw magnets bar magnets are made from alnico magnetic material alnico is an alloy of iron aluminium nickel and cobalt and has a high resistance to loss of magnetism the magnets are supplied in pairs complete with keepers which further help to keep the magnetism without gradual loss and to protect their magnetic surfaces north poles are denoted by a dimple or a notch shaw magnets rectangular bar magnet 12 x 5 x 40mm pack of 2