You are purchasing 500 mL of 25 ppm of the finest 99.99+% pure true colloidal Gold (made in the USA) in a clear BPA-free plastic bottle with a black phenolic cap. This product consists of 99.99+% pure Gold nanoparticles colloidally suspended in pure water. This product will be ruined if allowed to freeze, so make sure to have this delivered to an address where it is not delivered to an outside mailbox in freezing conditions.