I make my links from telephone cable - the type that's used indoors to wire-up outlet sockets. It's made up of a number of pairs of single-stranded wires. The pairs are identified by bands of colour - e.g. an orange wire with white bands is paired with a white wire that has orange bands.
The wire itself has a diameter of 0.5mm - and it's ideal for making links. Giving it a little stretch will straighten it - and make the insulation easy to slide off. When I use it to make links on my project board - I leave the insulation on. But it's easier to fit to the stripboard - if you take the insulation off.
You can form the links into the correct shape and size by bending the wire over the edge of a piece of stripboard. Count the number of tracks you want to span. Let's say that it's six. Subtract one - leaving five. Insert the wire into the stripboard - five holes from the edge of the board. Then bend it as shown - and you'll have a link that'll span six tracks. I use a little "Blu Tack" to hold the link in place while I solder.