Micro-wires bonded on a silicon chip. Coloured Scanning Electron Micrograph (SEM) of the bonded ends of three micro-wires on a silicon chip. Micro-wires are often made of gold. They link the integrated circuit of a silicon chip to pins by which the chip is connected to its outside electronic environment (such as a computer circuit board). Magnification: x175 at 4x5 inch size.