They are probably American Tackle guides with a Zirconia (Alconite) ceramic
coated with Titanium Oxide to get the blue color, it should make the guides
very corrosion resistant, many people on the gulf use their Mag Bass rods on
reds and snook among other species.
If you give your rods a freshwater washdown when you come in I haven't had a
problem with the black Fujis, gold frames and than chrome frames seem to
corrode or lose their finish first.