The laser lime top and bottom provide a great view of the board while maintaining a low profile with the help of our custom made C4 nuts. A benefit of our new nuts is that they can accept a bolt from either end so if you installed a HAT or pHAT, it can be secured to the nuts on the other side. In addition to the premium build, we are also including a heatsink to improve the cooling potential of the 1Ghz CPU on the Pi Zero.