The fives and six are from Chris Stambaugh. The fours are Warmoth.
(The six is for sale - you'd think after selling two previous six strings because they were too big for me I would have learnt my lesson. Having Chris re-build me the same thing as a five.)
This site may earn a commission from merchant links like Ebay, Amazon, and others.
You can apply a bit of lemon oil (not pure oil but something like dunlop 65) to the headstock, it will hydrate it and bring it back to the original darker shade. I also apply it to the back of my wenge neck too at every string change, not crazy dipping, just a single line down the back of the neck and then use the cloth to rub it around. Makes the neck super fast.