A downgrade ribbon cable that uses the 40-pin layout of the Raspberry Pi 3B/Zero1.3/2B/B+/A+ and converts it to the 26-pin layout of the model B/A. Connect your RPi 3B/Zero1.3/2B/B+/A+ to older prototyping boards and breakouts with the downgrade ribbon cable. Cable is 8" long, and pin #1 is marked with a red wire. This cable is not compatible with the Raspberry Pi Model B or A.