By Material 

As a good Yo-Yo player, you know well what suits you. If your style of play is very slow to do 'Tech' tricks, you know that your hands need 100% Polyester; however if you are more of a 'Slack' player, you know you need something more compact. How about Nylon?
Now you can try all Yo-Yo strings depending on your favorite material, which best suits your playing style.