This spool of magnet wire for Tiny Whoop LED projects is very fine red and green twisted wire. This wire does not have a bulky rubber or plastic or silicone jacket. Instead, it has been coated with enamel and then polymer for a tough and durable coating.
This is extremely light wire and is somewhat harder to work with.
You can strip it easily with sandpaper or your soldering iron. You'll know its stripped when you see shiny copper. Don't sand too much- best to leave as much of the copper core as possible!