These block magnets are 0.25 inch (6.4mm) long, 0.25 inch (6.4mm) wide, and 0.1 inch (2.5mm) thick. 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 2.4 lbs. Max Working Temperature - 176 F (80 C).
CHOKING HAZARD -- Small parts. Not for children under 3 yrs.