19mm Detachable Black or White Cooks (If Required) Buttons
These come with a split ring which can be used if you want to take them off perhaps for washing. You can if you want just attach them so they act like normal buttons.
I noticed the white one rings seem to have a bit of tarnishing.
You can buy 2, 4 or 8 using the selection box.
The more you buy the cheaper they work out each.