The early hookup wire used during the 50s & 60s is commonly known as cloth braid push back hookup wire. It was saturated in wax and braided with a variety of colors such as natural (white), black, yellow, red, blue etc. The standard wire used on Fender Guitars is 22 gauge, 7 strand and sometimes tinned with solder to add strength and stiffness. The early Fender amplifiers used a solid core hookup wire instead of stranded for hard wiring the circuit boards. After the cloth braid wire was eliminated, a Teflon coated insulation was used in production and Fender continued using the 22 gauge, 7 strand wire that was tinned. The Teflon hookup wire feels stiff and slippery to the touch. It works well when soldering because the insulation doesn’t melt or shrink easily when using hot soldering irons.