Purchased 6 stools for kitchen . The wood finish d...

Purchased 6 stools for kitchen . The wood finish does not last. Within a year the dark stain finish had worn off of whatever material they make it the backs of chairs out of. Metal parts seem sturdy. But wood backs are more comfortable. One chair back came cracked but they promptly sent a new one. I take a Sharpie marker to the edges of wood almost monthly to try to make them look decent . Not sure if I could even attempt to restain them as I don't know what material (engineered wood?) would lose its stain so quickly.