Ferrosilicon is an iron alloy composed of iron and silicon. Ferrosilicon is an iron-silicon alloy made of coke, steel scraps, quartz (or silica) as raw materials and smelted in an electric furnace.
● Magnetic dry erase green chalkboard for classroom,kids training● Firm 3-Layers board structure and light weight but sturdy ultra slim aluminum frame● Galvanized sheet backing supporting strong magnets● Packing with all spare parts inside one 37.5"x17.5"