All of those big donuts i've messed with have been a PITA. Tried unwrapping the first 2 i had, that was a nightmare. Hundreds of feet of plastic, maybe 2 pounds of copper, and a really nasty, dusty, chalk like donut. I've had some that are the magnet type inside. I just sold them as CBM.

It's funny though, i seen a couple of you say they have resale value. Wish i would've researched that back in the day. Must have sold hundreds of pounds of those for .25 c/pnd.