Atlas Pinnacle Pristine Shingles use a high concentration of copper-fortified granules and 3M Scotchgard to protect roofs from streaking. As rain washes down the roof, some of the copper in the granules dissolves and kills moss, algae, and molds. When the entire roof system (underlayment, starter strip, ridge caps, and Pinnacle Pristine shingles) is from the Atlas Signature Select family, the roof is covered by a fully transferable, non-prorated 15-year warranty on labor and materials. atlasroofing.com