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 fancy 54mm length cartridge brake shoes. 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).