Super-strong Neodymium discs, sometimes referred to as Rare Earth magnets, are among the most powerful magnets available today.  These north/south poled magnets are great for closures and clasps of all kinds including binders, portfolios, jewelry, purses, leather goods and fabrics.
These round nickel-plated magnet discs have adhesive on one side.
They and are sold in packaged sets of 10 north and 10 south poled magnet pairs.