<One plastic box is labeled "Univac memory elements" and has a small sample <of 3 size cores. The largest is about 1mm O.D. and the smallest is less <than half that size. They look very fragile as the I.D. is almost as large <as the O.D. Those are about the size of the 8E cores. <The other is a "Indiana General 15 mill memory plane" I guess the cores ar <15 mill diameter. There are 16 cores wired as a 4x4 plane. The wires are Big fat ones... not really. Those planes would be easy to drive and understand. that would be one I'd love to try. <much smaller than 30 SWG (about 28 AWG). I would say much smaller than 50 <(either) gauge, I need a magnifier just to see them. I'd have guessed thinner than #40. Allison