Eclipse Magnetics E802 Alnico Pocket Magnet, 1" Length x  0.31" Width x 0.87" Height Made from Alnico II material, alnico is a family of materials based on the same mix of elements (aluminum, nickel, cobalt and iron) 1.00" Length x 0.31" Width x 0.87" Height Can be used up to 550-Degree C magnetically stable at high temperatures 1/4" width of gap Good corrosion resistance