This true bronze casting grain contains no zinc and delivers a deep ancient bronze color with rich red undertones. Highly fluid, it melts quickly, casts cleanly and provides a good balance between strength and durability. The alloy takes a good patina. The grain is composed of 90% copper with some tin; it fits into the CDA#90700 category. Casting metal, because it comes ready to melt and pour into your mold, is fast and efficient to use and, because it is professionally produced, you can count on consistent, repeatable quality and composition over time.