Here are some of the poly spools I've aquired. I have yet to get any spools from Preformed Line Products or Aluma-Form. There is also a double groove poly spool that Hubbell has that I'd like to get. Left to Right: Chance grey spool, Chance black spool, Hendrix 53-2 A Neck dark grey spool, Hendrix Lt. grey spool. Bottom picture shows the top and bottom differences.