Classical Guitar Nylon Strings usually involve a silver wound nylon core for the bass strings and plain nylon for the trebles. Original gut strings would have been used for Classical and Spanish Guitars but these days Nylon is king. Our best selling classical Guitar strings include sets from D'addario Nylon Strings which are made in the USA. Savarez Classical Guitar Strings are made in France. We also stock Augustine, La Bella and a few other brands.