Wire ferrules are also a nice touch when connecting larger gauge wires to your amp.
What they are and why to use them here:
I've learned a lot from watching that guy's channel, and have applied a lot of them to my own installs...he also tends to have links to the products he uses in the video description.
If you haven't already ordered speaker and/or power/ground wire, I'd highly recommend Knuconceptz:
http://www.knukonceptz.com/
They carry really nice, high quality wire that is well insulated, and most importantly, flexible. They are also based out of Ohio, so things ship fast from them.
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