"Z-STOP" MOSS CONTROL STRIP WITH NAILS50' rollA roof moss, algae and fungus inhibitorApply in strips to old or new roofsWorks with any wood or composition roofLasts 20+ yearsEasy to installSafe for roofing shinglesWorks on any roofingIdeal product for both do it yourselfers or professional roofersMade from 99.2% pure zincIncludes bag of 26 1-1/2"L zinc nailsDiscovery Regional