These ring magnets are 0.500"(12.7mm) outside diameter x 0.250"(6.4mm) inside diameter x 0.125"(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. Their individual pull force is approximately 2.6 lbs. Maximum working temperature is 176 F (80 C).
CHOKING HAZARD -- Small parts. Not for children under 3 yrs.