These magnets are 0.250 inch (6.4mm) cube. They are composed of grade 40 neodymium iron boron magnetic material and are plated in nickel-copper-nickel for a shiny corrosion resistant finish. Their individual pull force is approximately 6 lbs. Max Working Temperature - 176 F (80 C.
CHOKING HAZARD -- Small parts. Not for children under 3 yrs.