These are tiny metal pins for the JST PH housings that we sell. You will need one pin for every 'hole' that your housing has.
These can only be purchased in lots of 20.
Ideally these pins are crimped with a special tool. Crimping effectively means trapping the wire by folding a couple of the tiny metal 'wings' on this pin over it. Despite crimping being the best way, you could fold the pins over using a small pair of wire cutters or pliers. Failing this, you could just solder your wire to this pin.
Note : These pins have tiny locking tabs on them, so that once they're inserting into the JST housing, they will not come out easily. It is possible to use something like the tip of a pair of fine tweezers to push the tab down, and withdraw the pin, but it's fiddly!