Solderless breadboards connect pin to pin by metal strips inside the breadboard. Some manufacturers provide high-end versions of solderless breadboards. Several images in this article show such solderless breadboards. For this reason, solderless breadboards are also popular with students and in technological education. Solder-less breadboards and the decreasing cost of professionally made PCBs have nearly eliminated this technology. The choice of the DIP format allows for easy prototyping on breadboards. Solid wire is useful for wiring breadboards. This replaces the use of breadboards and wires. Both examples refer to and describe other types of breadboards as prior art. Breadboards, perfboards, and stripboards are common for testing new designs. Solderless breadboards are further limited by their voltage and current ratings. Breadboards can therefore be used in mobile applications, such as on airplanes.