https://www.3m.com/3M/en_US/roofing-granules-us/products/cool-roofing-granules/
Cool Roofing Granules | 3M Roofing Granules - US
3M™ Cool Roofing Granules are used in shingles that can be energy efficient, solar reflective and economically friendly.
cool roofinggranules3mus
https://www.3m.com/3M/en_US/p/d/b00044978/
3M™ Cool Roofing Granules | 3M United States
3M™ Cool Roofing granules are based on a patented technology by 3M and are available in a wide variety of rich colors that can create the perfect shingle color...
3m united statescool roofinggranules