High-performance Petrobond®* clay based foundry sand: professionally formulated, produced, and quality inspected in the USA Compatible with Precious and Non-precious Metals: Silver, Gold, Pewter, Aluminum, Zinc, Copper, Brass, Bronze Near die cast finish: Especially Useful for high-detail casting of Decorative and Functional items Fine-grained 130 Mesh Sand for balance between mold detail and venting Premium-Quality Ingredients: Genuine Petrobond® Clay, Oil, and USA-Sourced Round-Grain Silica.