I once had a MC2 'identifying chart' that could tell you the size and part number of a given piece of MC2 based on the notch frequency. The notch is caused by the repetitive spacing of the little plastic disks. Fused disk has similar problems but both types are very low loss and high VP cables.
"Quality Cable Work for Over .031 Millenium"
This is CABL.com posting #297396. Tiny Link: cabl.co/mbpwS