This wire is AWG 16 gauge copper electrical wire stripped of insulation. You get 3 pieces from each length of wire. Some types vary in color by strand. You will need approximately 2 times the length to be braided of each strand plus enough to hold on to.
To make 2976, start with 4 strands holding 2 strands in each hand. Take the strand that is furthest away over 2 under 1 and back around, alternating. The strands end on the same side they started.
To make 2979, start with 4 strands in one hand. Work the furthest one under/over/under and back around. Repeat.
Color is from heating with a torch while applying solder to bind the ends. Ends are then cut and filed smooth.