I like those bowmen.
I use EZ Line for the strings.
They are actually sold to model railroader to string telephone and power wires but I had them leftover and they seem to be good enough for bowstrings. Some of the advantage of this elastic string: It glues well with CA glue. It does not get bridle even exposed for years to the sunlight and I never had any of them snap on me and I have been using them for almost 20 years.
It is a pain to loop it and attach to the bow or crossbow and sometimes it ends up not quite right, as seen in my photo. Once attached with glue, you can pull it back if needed and fix it with another dot of CA glue.
The Company can be found here and in the USA it is even sold at Amazon.
https://berkshirejunction.com/