You are buying 1 Pound of Silicon Dioxide. The item is in 2 polypropylene bottles each containing 8 ounces of product. Silicon Dioxide (SiO2), also known as Silica, has hundreds of uses. Silicone rubber / toys - Anti-Stick Dusting, Anti-Caking agent, Mold Relaese, Structural Materials / Microelectronics / Electrical Insulator / Food and Pharmaceuticals. Bottles are made of sturdy polypropylene. The square, “space-saver” shape ensures that the bottles fit snugly on a shelf. The wide mouth makes for easy dispensing and stackability. To ensure a spill-free journey, the screw tops are shrink-wrapped and the bottles sealed in plastic.