Darice® barrel-shaped, silver, 3 x 14mm magnetic clasp. 5 sets per package.
Magnetic clasps are strong, but easy to open and close. To open smaller magnetic clasps, simply slide the pieces apart. For larger magnetic clasps, snap the two sides apart with a motion similar to breaking a stick. (Never pull these clasps open--this may loosen the magnets from their settings or break your stringing material.)