50′ Roll ZStop With Nails, A Roof Moss, Algae Fungus Inhibitor That Is Applied In Strips To Old Or New Roofs, It Works With Any Wood Or Composition Roof, Lasts 20 Plus Years, Easy To Install, Completely Safe For Roofing Shingles, Works On Any Roofing Material Made Of Composition, Flat Tile, Metal, Shingles Or Cedar Shakes, An Ideal Product For Both The DoItYourselfer The Professional Roofer, Made From 992 Pure Zinc