These very small cubes are often used with Hall Effect sensors. The B111 has an incredible force-to-weight ratio. Just one of these small cubes will hold a standard 8.5" x 11" sheet of paper to a refrigerator.
These magnets are sold in packs of 10. Order a quantity of 1 and get 10 magnets. Order a quantity of 2 and get 20 magnets. Order a quantity of 3 and get 30...