Elixir 11100 Polyweb Light Medium 13/56 Set for Acustic Guitar with Polyweb coating have the warm tone and smooth action of non-coated strings, yet they feel like softer to the touch. The ultra-thin Polyweb coating keeps these strings sounding fresh and new for a lot longer than conventional strings. The Ployweb coating cuts down on finger squeak while reducing the bite of the strings on your fingers. They have a mellow and warm tone, and maintain their original sound and feel longer than most strings.Elixir’s 80/20 Bronze strings are made of 80% soft copper and 20% durable zinc, presenting a smoother, mellower tone than Phosphor Bronze acoustic strings. 013-017-026w-035w-045w -056w.