From the manufacturer:
Sharpie: Metallic Markers. The reliability and dependability of a traditional Sharpie marker is now available in opaque metallic shades! The brightly colored ink is quick-drying, permanent, and both fade- and water-resistant making them great for a variety of coloring and crafting purposes. This package contains two Fine-tip markers (one each of Bronze Metallic and Silver Metallic). Non- toxic, conforms to ASTM D4236. Made in USA.