Here's more from Elixir:

Elixir® Electric Nickel Plated Steel Strings with OPTIWEB™ Coating give you the performance of a natural string — that crisp tone, natural feel and playable grip you know and love—without sacrificing the signature long-lasting tone life of Elixir Strings.

• Only coated string brand to protect the entire string with an ultra-thin coating, keeping gunk out of the gaps between the windings
• Extended Tone Life – players report their tone lasts longer than any other string, uncoated or coated
• Consistent performance and tone – ready to play whenever you are
• Smooth feel that is easy on your fingers and enhances playability
• Reduced finger squeak – good for both performance and recording
• Anti-Rust Plated Plain Steel Strings resist tone-deadening corrosion, ensuring a longer life for entire set
• With less hassle and expense of frequent string changes, spend more time making music