How to choose classical guitar strings

1. What tension should classical guitar strings be?
2. What is the difference between hard tension and normal tension classical guitar strings?
3. Do classical guitar strings break easily?

What tension should classical guitar strings be?

The string gauge is 0.029” at a tension of 16.4 lbs. You can see the extra hard tension string needs to be put under a greater force to generate the same note, the low E.
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Let's look at some numbers.

What is the difference between hard tension and normal tension classical guitar strings?

It follows that high tension strings are generally heavy strings, while normal and low tension are lighter strings. The three treble strings are commonly made of nylon, but can also be made of more dense fluorocarbon.

Do classical guitar strings break easily?

In my experience, classical guitar strings have a life expectancy of between 1 second and 100 years. They can snap for no apparent reason; they can fray at the saddle or nut; they can come unwound.