GAF Slateline 33.33 sq ft English Gray Architectural Roof Shingles value:Case Finished opening width is suggested Finished opening width is suggested to be 4 in smaller than the door width whether expressed or implied Diamond Cut Granules add dimension and depth to the shingle with their multifaceted design and light reflective construction Micro Weave Core offers a strong foundation that helps resist cracking and splitting UV Blocker (granules) protects against damaging sunlight for durability and long life Dura Grip Adhesive seals each shingle tightly and reduces the risk of shingle blow off 18 Shingle Length (imperial) (Inches) 40 Shingle Width (imperial) (Inches) 17 Package Type Bundle Bundles per 100 Sq Feet 3 Fire Rating Class A Wind Rating (MPH) 130 Impact Resistance No Underlayment Required Yes Algae Resistant Yes Manufacturer Color Finish English Gray Warranty Limited lifetime Coverage Area Unit of Measure Square feet Coverage Area per Package Quantity 33