.031" music wire, 39.5"in long.
We have sourced these pushrods from Europe and have been using them for a while now. They are constructed using a double wall design; a tube in a tube design and we have been impressed with them. The inner casing, is so slippery the rods can be looped into nearly a circle and still have reasonably low friction. The outer casing is the bondable layer. Scuff it up with sandpaper and glue it into position using CA, Epoxy etc.
Can use #13 music wire if you need a longer length of wire.