Eclipse Magnetics E846 Alnico Rectangular Bar Magnet, 2.36" Length x 0.59" Width x 0.2" Height (Pack of 2) Made from Alnico 5 (Alcomax 3) material, alnico is a family of materials based on the same mix of elements (aluminum, nickel, cobalt and iron) 2.36" Length x 0.59" Width x 0.20" Height Can be used up to 550-Degree C North pole is indicated by a notch Pair of rectangular bar magnets