Designed to imitate the layout and connections of a standard solderless breadboard, Adafruit’s Perma-Proto PCBs are available in various sizes to suit the needs of any application. With the exception of the Flex Perma-Proto, all PCBs have a white silkscreen topside and breadboard style markings, making transferring components from solderless breadboards easy. The bottom has the 5-hole pad design that matches a classic breadboard with power bus lines and no mask, which allows easy cutting of traces when necessary. With 1.2 mm diameter drill holes, even parts with big leads will fit, and all holes are thru-plated for strength and finished in gold plate to prevent oxidation often encountered with bare copper, perforated prototype boards. Each board also includes mounting holes to simplify attaching PCBs to an enclosure.