GHS Ukulele Strings
To be specific about those materials, GHS offers the choice of nylon or fluorocarbon strings. Nylon is the typical choice, and you can customize your instrument's look by going with black, like the H-10 Hawaiian Ukulele Black Nylon Strings, or clear, as in the H-T10 Standard Ukulele Clear Nylon Strings. Just match the set to the size of your uke, and you'll be good to go. With the right fit, any pack of GHS strings can be counted on to give you great results on your favorite ukulele.
If you're looking for a set of strings that are really special, one of the fluorocarbon varieties might be the way to go. This special material is designed to give you more loudness and brilliance at a slightly higher tension, which makes them well-suited to fingerstyle and picking. You can also get sets aimed at specific tuning styles, like the GHS Fluorocarbon Soprano/Concert D Tuning Ukulele Strings. There's even a set with a wound C string, so you have lots of options for customizing the feel of your uke.
Strings are more than just another part of your instrument. They're the interface - the piece that you connect with physically. That makes them crucial not only for your sound, but also for playability and feel. The good news is that those are three areas in which GHS ukulele strings really shine. When you want to find out just how great your uke can be, slap some of these strings on it and you'll see.