Elixir® Strings are available in two different 'flavors'. Both feature the same patented protection and deliver the same extended life, but differ in tone and feel. What's the difference between NANOWEB® and POLYWEB® coatings? The difference between our coating 'flavors' is found in the tone and feel of the strings. NANOWEB® coated strings sound and feel like uncoated strings - they are bright and lively, and the coating is so micro thin that you can barely tell it's there. POLYWEB® coated strings have a balanced tone and smooth response - they sound like strings that have been 'played in'. In addition, POLYWEB® coated strings feel comfortably smooth and help reduce finger squeak. Elixir® Strings with original POLYWEB® coating... - Have a balanced tone and smooth response - Feel comfortably smooth and reduce finger squeak