<p>These aluminum preformed shingles are installed under shingle lines along dormer or roofline slopes for protection from water infiltration. There are 100 pieces in each package.</p> <ul><li>Offers flashing protection along dormers and rooflines</li><br /><li>Install under the course of shingles along the roof line to prevent water intrusion</li><br /><li>Direct water flow to avoid damage</li></ul>