Polyweb is Elixir's completely unique approach to coating guitar strings. The heaviest shield offering from Elixir coats the complete string with a micro-thin polymer tube that you can actually see and feel. It stops any gunk getting at the strings and gives a smooth feel with the added benefit of reduced finger squeaky noise. Beneath the coating is an original-style 80/20 bronze wound string which has an inherently bright and vibrant tone. The Polyweb coating deliberately rounds off some of the brightness to give a warm sounding set of acoustic guitar strings which'll last for ages! Elixir says:Elixir Polyweb Acoustic Guitar strings are coated in a unique way to protect the wound strings from all contaminants. A flexible, strong, yet micro-thin polymer tube defends the critical zone of tone from invading enemies. Nothing (including the coating) gets between the windings. Elixir strings sound great 3 to 5 times longer than ordinary strings, have a balanced tone with smooth response, feel comfortably smooth and reduce finger squeak. After experiencing Elixir strings it's hard to go back to the old way of life.