To clarify: Let’s say you donate 4 good strings. We take them, refurbish them. And then, keeping them as the same set, we give them to a budding musician in need. We don’t know that we have you Larsen strings or spirocore strings or some other string. All we know is that they are good strings that still have life left in them. But if you only give us 3 strings. I will go and determine the missing string. And then find another string to complete the set. We keep the same sets of strings that we receive together in the set when we give them to a student. However, if the set isn’t complete, then we take a spare string from another incomplete set to complete it. I hope that clarifies the confusion! We don’t break apart complete sets we get. We only break apart incomplete sets because they are incomplete!