These block magnets are 1.000 inch (25.4mm) long, 1.000 inch (25.4mm) wide and 0.125 inch (3.2mm) thick. They are magnetized through the thickness. They are composed of grade 40 neodymium iron boron magnetic material and are plated in nickel-copper-nickel for a shiny corrosion resistant finish. Maximum working temperature is 176 F (80 C).
CHOKING HAZARD -- Small parts. Not for children under 3 yrs.