This video is part of a series, details about materials and methods used will be found in Part one and two. I have posted the links below for your convenience.
Beading Chain 101 part Two
https://www.youtube.com/watch?v=AoDYqZMNDlM&t=376s
Beading Chain 101 part one
https://www.youtube.com/watch?v=zXAloMciDP8&t=341s