From the manufacturer:
It took more than a year of R&D and working with over 1000 bassists to develop Elixir® Strings for Bass. The NANOWEB® Coating on our Nickel Plated Steel and Stainless Steel Bass Strings is more durable, delivers unparalleled tone life and also raises the bar in tone, feel and response. Bass players tell us that Elixir® Strings retain their tone longer than any other string – uncoated or coated.
Gauge: 14077 4-String Medium/Long Scale .045 .065 .085 .105