These are tiny metal pins for the JST SM Female housings that we sell. You will need one pin for every 'hole' that your housing has.
We sell these in packs of 30
Note: The male pin goes into a female housing
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.
You can find the JST SM housings here