The local favorite cantilevers, although the Dia-Compes may overtake them. For any cantilever brake use, these are as good as they get. Spray-painted silvery gray.
When the stock pads wear out. buy . When those pads wear out, all you gotta do is buy new pads and slip them in. It's easy, and you don't have to re-toe in your brakes.
Sold individually (each wheel).