Skunk stripe is inlay I don t think the skunk stripe on the back of certain types of electric guitar necks can be considered inlay because it s not cosmetic and it fills a structural hole left channel for truss rod as opposed to just being flat piece of material filling a specially cut depression solely for cosmetic purposes i e with certain necks you MUST have a skunk stripe You don t find mother of pearl skunk stripes do you In other types of striped neck the stripe is due to the neck wood being laminated from several piece of wood which most definitely is not inlay either