NulSom Inc. 40p to 40p GPIO Ribbon Cable for Raspberry Pi 3/Zero 1.3/2/B+/A+ (8" 20cm) Compatible with Raspberry Pi Model 3B/Zero 1.3/2B/B+/A+ GPIO Use your RPi 3/Zero/2/B+/A+ with prototypes consisting of a 40-pin breakout Female To Female 40Pin IDC Ribbon Cable 8"(20cm) cable length, dark grey color Pin #1 is marked with a red stripe