Elixir Nanoweb Electric Guitar Strings.
These wound strings are sleeved in an ultra-fine coating to protect from contaminants and corrosion. Nanowebs sound good for 3 to 5 times as long as conventional strings. The fine coating is designed to retain the tone, attack and feel of conventional strings. Preferred for slide playing, where the tone and sustain are closer to that of uncoated strings. After all strings are not just strings. They are the connection between you and your music. When strings go dead, so does your inspiration to play. Elixir set out to develop the ultimate strings which would deliver great tone for a really long time, that would stay feeling clean and smooth,and so would always inspire you to play.

All sets of Elixir® Strings for acoustic and electric guitar include Anti-Rust Plain Steels. Elixirs breakthrough plating technology prevents rust and corrosion, extending the life of the plain steel strings 3-5x compared to ordinary strings. Best of all, you get great tone and fresh, clean feel every time you pick up your guitar.

What's the difference between NANOWEB and POLYWEB coatings?
The difference between Elixirs coating 'flavors' is found in the tone and feel of the strings.