Didn't read all 9 pages so sorry if it's been said. The shape and design of the tethers are also different.

The red and green tethers are 2 strands (1 red 1 green) that are twirled around each other like a double helix.

The blue tether is 1 thicker line with a lighter (light blue, almost white) wide center strip and darker edges (darker blue) side stripes.

Obviously it's not as loud as seeing the colors as designed but they are actually shaped differently and have different design.