The gauges of tennis strings are essentially the thickness of the string. The lower the number the thicker the string, which equals to more control and durability vs a high number and thinner string with more spin and power. There is no universal chart for the way brands represent the thickness of a string, therefor it is best to check the millimetre of the diameter. Some strings also have halfway sizes for example (16L) which stands for light and means the thickness is halfway between 16 and 17. 

 

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