Nothing like having a bag of alligator clipleads handy while working on a new design. I use a ton of them in all different sizes and colors. 20ga wire and each package contains 2 Black, 2 Red, 2 White, 2 Yellow, and 2 Green. These things are indispensable for amp techs, hobbyists, and builders. You might as well buy a bunch of these because if you are like me, no matter how many I buy they seem to disappear eventually.