1. A PYROPHORIC MASS SUITABLE FOR EXTRUSION TO PRODUCE FINISHED FLINTS IN ROD FORMATION; CONSISTING ESSENTIALLY OF CERIUM (MISCH METAL) WITH ZINC RANGING FROM 5% TO 25% BY WEIGHT, AND HAVING AN ADDITION OF AT LEAST ONE OF THE ELEMENTS SELECTED FROM THE GROUP CONSISTING OF COPPER, CADMIUM, ANTIMONY, BISMUTH AND MANGANESE, SAID ADDITION RANGING FROM 2% TO 6% BY WEIGHT, AND A FURTHER ADDITION OF MANGNESIUM AMOUNTING TO ABOUT .5% TO 5% BY WEIGHT TO ADJUST THE EXTRUSION PRESSURE TO AT LEAST 4,100 KG./CM.2, THE BALANCE BEING CERIUM (MISCH METAL).