Element	Content (in %)
Lead (Pb)	Between 25 and 55
Copper (Cu)	Between 20 and 50
Zinc (Zn)	Between 0.02 and 1
Silver (Ag)	Between 0.1 and 0.3
Antimony (Sb)	Between 0.2 and 0.7
Arsenic (As)	Between 0.4 and 2