These disc magnets are 0.250 inch (6.4mm) diameter and 0.063 inch (1.6mm) 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.