NulSom Inc. Half Size - RPi Proto Breadboard PCB Kit Raspberry Pi 3 / Zero 1.3/2 / B+ / A (40p Box Header) Half size proto breadboard PCB for Raspberry Pi 3B/Zero1.3/2B/B+/A+ Includes 40 pin box header for Raspberry Pi 3B/Zero1.3/2B/B+/A+ Six hole pad design to further improve usability Gold plated finish prevents oxidation, High quality RoHS ENIG finish for easy soldering All holes are through-plated for strength, 1.2 mm diameter drill holes will fit even the biggest leads