GUT & SILK 900

Up to the middle of the 20th century, the only available strings for guitar were plain gut for Trebles and wound on silk core for Basses. 
Their acoustical performance was quite different from that of modern synthetic strings.

The salient characteristics were a marked tonal presence, and brightness typical of gut strings (certainly superior to plain nylon and in some respects closer to fluocarbon strings) while the silvered copper would 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. 
The Treble tension's profile is not  so scaled (like in use in all of the modern guitar's sets): it is just ligthly scaled, like the usual standard of that time.

This set which is made with only one degree of tension, riproposes excatly a historical assembling, tipycal of the period of Llobet and Tàrrega by using only genuine gut strings for Trebles and  silk's core wound basses, as it was said by Pujol in the "Escuela Razonada de la Guitarra" of 1934.