These cube magnets are 0.125"(3.2mm) Long x 0.125"(3.2mm) Wide 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 1.5 lbs. Maximum working temperature is 176 F (80 C).