.070

A folk guitar string purchased individually with a gauge of 0.70 refers to its diameter. In general, the larger the diameter of the string, the thicker it will be and therefore the more tension and volume it will have.

However, it should be noted that different string manufacturers may use slightly different tension and diameter measurements, so it's important to check the manufacturer's specifications for accurate information on the strings you're buying.

In general, a folk guitar string purchased individually with a .70 draw is considered medium gauge and is often used for the high E string on an acoustic or folk guitar.