Wire wrapping - on the burnt sienna wire you can see spaces between some of the coils which shouldn't be there. Funny thing is, the finer wire is easier to wrap than the thicker gauge wire, but it is easier to get that tight wrap with the thicker gauge.
I need to get back to a bobbin necklace, but I have been enjoying these brooches. Sketched out several more variations in construction last night. Will see what wins out when I get to my craft room - bobbins or brooches!!