· 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 conductors· 50 continuous feet of 12AWG 2-conductor speaker Wire | on a spool· Clear, flexible PVC jacket with an easily visible blue stripe on one side for polarity identification· One side of the clear outer PVC jacket is marked with an easily visible blue stripe to indicate polarity.