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String Thing USA makes the String Thing String Straightener—an easy way to keep your strings straight. The straighter the string the more control you have as a player. Strings move, now you have an easy way to move them back. All you have to do is brace your racquet, place the String Thing on the misaligned string, press down firmly and roll it up and down. Straighten main and cross strings in both open and denser patterns. Your strings will stay straighter, improving your game and extending the life of the string.