These are simply the pulls or sliders or zipper-uppers or zipper cars or zipper heads.......
A #6 or #5 invisible is the largest invisible zipper made. My pulls will fit on most, not all, #5 invisible zipper tape.
Quick tip: if a pull doesn't fit on the end of the coil, turn the coil around & try the other end..... sometimes it works!
Tip #2: Invisible zipper has a little fold in it that folds the coil to the back. So no, you can't use this on STANDARD COIL tape to make it an invisible zipper. Use a reverse pull or head to make a standard coil zipper almost invisible.