Varian Semiconductor Equipment Associates (VSEA) is the ion king. The company is the world's top designer and manufacturer of ion implantation equipment and systems, which beam ions into semiconductor wafers to modify their electrical properties. VSEA has a common equipment platform, the VIISta single-wafer system, which is designed to cover a complete range of applications, such as high-current, medium-current, and high and ultra high-energy doses of ions. It also offers product upgrades, spare parts, and technical support. Customers outside North America account for more than 70% of the company's sales. In 2011 Applied Materials acquired VSEA for about $4.2 billion.