4 pin to 4 pin FireWire (IEEE-1394) cable.

Use this cable to interconnect FireWire & iLink devices with 4 pin connectors.
Simple, economical and reliable.
Fast data transfer.

What is the difference between 4Pin, 6Pin and 9Pin Firewire connectors

Each is a different size and configuration of connector. The 4 pin and 6 pin are ieee 1394a compliant which supports speeds up to 400mbps. The 9 pin connectors are ieee 1394b and support up to 800mbps. The ieee 1394b are generally backward compatible with the slower version but the speed would be limited to 400mbps when connected together.

4 pin is the smallest of the connectors and is generally found on portable devices such as camcorders and some laptops. It's a small rectangular shaped connector with an indent on one side.

The 6 pin is the most ubiquitous and is found on most devices like desktops, laptops, external drives, etc. It is similar in size to a USB and similar in shape. It is a flat rectangular connector with beveled edges on one side making the ports look like an elongated "D."

The 9 pin is the most recent type. It is found on newer high speed devices and computers. It is a block shaped, rectangular connector.