These were the first mica strips cut from a sheet of mica and intended to help hold the wire in the test cell.  The strips were not perfectly consistently cut due to the crude nature of the saw, and were, therefore, the last to be used.  We kept them as spares in case we needed them, but since we got a nicer tile saw, we will cut more consistent ones for the next test cells, instead.  Note that one of the strips has test holes we made in the end.  Those holes are intended for the bolts that make the termination for the wire.