Pre-WWII German mechanical pencil leads made by MARS Staedtler. The price is for a single metal holder containing about 12 pencil leads. Select either Black or Blue leads from the drop down before adding to cart.
We haven't checked every tube but they seem to all have 12 leads. Some tubes are difficult to open and some may have some very light rust. These are new old stock taken from the original bulk packaging. The black leads come in a silver tube and the blue ones have a brass tube.