Use for making metal casting molds for a variety of metals ranging from Pewter to Cast Iron Easy to (re)use, simply add water to maintain moisture Contains Premium 120 Mesh Olivine (Magnesium Iron Silciate) Raw Sand and Bentonite Blend Professionally Formulated, Pre-Mulled, and Quality Inspected (100% ready to use) More stable, better finish, safer, and longer life than competing silica sands TETON-BLACK 120 is a premium-quality, water-bonded foundry sand formulated especially for high temperature metal casting applications in the small shop. When properly used, it can provide exceptional surface finishes with respect to most competing sand products on the market. TETON BLACK 120 uses premium olivine sand which has greater high temperature stability, provides better surface finishes, and provides longer life than silica or other cheaper sands.