Buy with Confidence: With Monoprice's Lifetime Warranty on all Cables, you can rest assured we stand behind our products and our customers.Oxygen-free 99.95% pure bare copper conductors250 continuous feet of 12AWG 4-conductor speaker Wire | on a spool. The white outer jacket is CL2 rated, making it safe for use within the walls of residential class buildings. Each conductor has an individual, color-coded jacket enclosed within the outer white CL2 jacket