Shaw magnets alnico bar magnets shaw magnets aln050 buy alnico bar magnet 15 x 10 x 50mm pack of 2 from shaw magnets 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 aln