These are PCB strips that enable you to mount Dual-in-line ICs to your breadboard. They are available in 0.3" pitch and can be trimmed to suit individual IC configurations*. They come as a kit but not include IC sockets. The sockets can be purchased separately. If you are using surface mount ICs you can discard the IC socket and solder directly to the pad. Kit consists of two x 0.3" boards up to 28 pin long.