Some info on badminton, will be useful if u need

String gauge is designated numerically, with thicker strings having lower numbers, as shown in the table:
Gauge Diameter
20 .80-.90mm
20 micro .78-.82mm
21 .70-.80mm
21 micro .68-.72mm
22 .60-.70mm

Thinner strings, for example, give a player more power, which is why 21microgauge is “hot” among top players. There’s also cost, control, “feel,” ease of stringing, and a few others properties to consider and balance against one another when you’re replacing your strings. If I had just one word of advice to give, it would be this: if the string in your racket is old, replace it now. Your game could see an immediate improvement.