Purchased 3-4 years ago, and have been partially used. The yellow-packaged roto yellows strings are missing the 4th string. SIT strings have 5 thin strings remaining. The package likely states the size, but I can't tell just by looking. Would these be suitable as spare strings? They aren't obviously rusty, but they aren't like new either. Please refrain from purchasing if you are overly concerned about condition. I am also listing these on other sites, so I may suddenly remove the listing. Also, please understand that if they sell on another site first, I will cancel your order here.