I took in insulated wire and got low r rate of .30 lb. ! Best i can tell the .25 lb is much better with all that metal weight with it. I cut two of them apart and got about .1 oz the transformers only weigh a quarter pound. So at my yard unless i can convince them other wise the motors are better weight than insulated or copper. I could see it if they were big. And i have considered harvesting those i still havent taken the crate in yet. But i really appreciate the advice i may take it i may not but keep it coming any way. I love this forum.