Funnily enough I've just got a set of these jumpers off eBay.
https://www.ebay.co.uk/itm/122046305758
Made with Van Damme 4mm cable.
Seem to be well made and for £15 saves me the bother of making some myself.

Do they make my speakers sound better?
Maybe...
I think so....

Well anyway, I had fun playing records testing them out.