CMS Magnetics® N45 Dia 1/2" x 1/16" Disc , Package of 10 Neodymium Magnets Rare Earth
Rare earth magnets are the strongest type of permanent magnet currently made. They are amazingly powerful for their size and have innumerable uses. These magnets are 1/2 inch (0.5) x 1/16 inch (0.0625) disc. They are composed of grade 45 neodymium iron boron magnetic material and are plated in nickel-copper-nickel for a shiny corrosion resistant finish. Their individual pull force is approximately 3 lbs.  All magnets are fragile so are these magnets. They may snap. But if used properly it can serve you for a lifetime. Keep them away from children and pacemakers. They may pose a CHOKING HAZARD, and can be LETHAL if swallowed.