"Z-STOP" MOSS CONTROL STRIP WITH NAILS; 50 roll; A roof moss, algae and fungus inhibitor; Apply in strips to old or new roofs; Works with any wood or composition roof; Lasts 20+ years; Easy to install; Safe for roofing shingles; Works on any roofing; Ideal product for both do it yourselfers or professional roofers; Made from 99.2% pure zinc; Includes bag of 26 1-1/2"L zinc nails; Discovery Regional