AMBRA 900 (this is the syntetic version of the ‘Gut & Silk 900 set) Up to the middle of the 20th century, the only available strings for guitar were plain gut for Trebles and silk wound strings for basses: their acoustical performance was quite different from that of modern stringings. The salient characteristics were: a marked tonal presence, response and brightness typical of the gut strings (certainly superior to plain nylon and in some respects closer to  fluocarbon strings) while the basses, on the other hand, possessed an exquisitely vocal quality, i.e. not so bright as, and with less sustain than, modern wound on nylon strings and more fundamental heavy. Our Ambra set was developed keeping in mind this historical fact, in order to best re-create, by means of modern synthetic materials, the sound of gut and silk -wound basses of the time of Llobet and Tàrrega. This set was conceived for one grade of tension and consists of rectified New Nylgut®  for Trebles, adopting the representative mean diameters as indicated by Pujol