Savarez 5209R 9th string (B) standard tension, Single String, .061 in

Q: Hi, what's its tension in kg?

Q: I have an 8 string C. Guitar. I've used this strings but I feel the 8th string to lose, would it be adviceble to use this 9th string instead?

Q: I am looking for the 5209R , SI-B-9 snare ?
Is this the one ?

Thanks in advance for your answer

Q: Hi, I hope you can help me. I have a 7-string guitar where I use to put a C-string (Savarez) in the seventh. However my repertoire makes me change the tunning to a B and, sometimes, to an A, so my question is: Could I use a B-string in my guitar, even if I use to tune the seventh in C? Which problems would I have doing this?