as a user I have no clue on the manufacturing, but can tell you that this set is a very thin copper wire with tiny, tiny bulbs that are barely bigger than the wire. They are in line with the wire. The whole 60ft come in a small reel barely bigger than a closed fist! The wire is not as pliable as a strand of thiner copper. If you bent it severely you would end up with a kink. I love how unobtrusive they are. I stung them on my sense, and you cannot tell they are there, even though it is a white tree fence!