 The ten and the six solid core hookup wire spool sets. These are 22 AWG and they are perfect for breadboarding and prototyping. We get white, black, gray, brown, dark purple, blue, green, yellow, orange, and red. Look at the set of six. You get the blue, white, green, yellow, red, and black. Here's how you use them. So I will just take a little bit off of the ends of my wire and end up running them like that. The solid core, this gauge works great. 22 AWG works great for pressing them in and getting a solid connection. This isn't falling out easily. I first built this on a breadboard, then I just moved it over to the PERMA Proto and was able to make sense of my wiring and match my fritzing diagram. That's my product pick of the week. This week it is the ten and six spool hookup wire set, solid core.