Achieve superior roof protection and a sleek appearance with Timberline HDZ Cedar Falls Algae Resistant Laminated High Definition Shingles (33.33 sq. ft. Per Bdl) (21-Pieces). These shingles feature LayerLockTechnology and the StainGuard Plus Algae Protection Limited Warranty, ensuring durability and algae-fighting power. With a lifetime limited warranty and advanced technologies, including Strikezone nailing and Dura grip sealant, these shingles offer exceptional wind uplift performance and the highest roofing fire rating. Plus, they are eligible for the Windproven Limited Wind Warranty and come with a Lifetime Ltd Transferable Warranty with Smart Choice Protection. Trust GAF, a leader in roofing solutions, for your roofing needs.