I don't think the plugs are removable. But I don't really understand what is being offered here at all (only the cable, cable and plug assembled, but cable and plug separately to make yourself).
Anyway. With patch cables, plugs are pressed onto the cable or wires. So that this connection cannot be loosened again for reuse. A special crimping tool is needed to make plugs.
https://www.digitec.ch/de/search?q=crimpzange
Another possibility would be to take laying cable and make a socket at both ends where you can then plug in patch cables.