These tiny little magnets are an interesting size. Small and inexpensive, you can buy a bunch for a low price. Great for hanging photos, as one or two of them will hold a picture firmly to a metal surface, and they are virtually invisible. They are also perfectly sized for use in small electronic devices and sensors.
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...