For 1/6 scale tracks you can use basically any metal wire with a diameter of 2mm.
Anyway, there are better alternatives than classic steel wires.
Spring steel wire is difficult to cut, and ordinary gardening wire has to be laboriously straightened.
Plus - both are relatively heavy.
It is lightweight, straight and easy to cut.
1. aluminium based - AlSi5 TIG rod (Aluminum Welding Rods) - used for welding with TIG.
It is lightweight, straight and easy to cut.
https://www.google.com/search?q=AlSi5+TIG+2mm
https://www.aliexpress.com/item/1005004921694215.html
https://www.aliexpress.com/w/wholesale- ... g-rod.html
2. copper based - Stud Welding Nails - used at car workshops (thanks vanhasen for this idea).
Almost the exact length.They are sold in lengths of approx. 50mm.Probably the easiest to work with.
https://aliexpress.com/item/1005004626951420.html
https://www.aliexpress.com/w/wholesale- ... Nails.html
https://allegro.pl/oferta/nity-gwozdzie ... 3596074545