The Timberline series of shingles is the most popular line of shingle in America.  GAF Timberline shingles are designed with a "Shadow Accent" effect which allows your roof to have maximum dimensionality and depth.  A Timberline 30 shingle carries a 30-year limited warranty and a 70 mph wind warranty.  Timberline 40 has a wind uplift warranty of 80 mph and a 40-year limited warranty.  For the best warranty in the Timberline series, choose Timberline Ultra, this shingle has a lifetime limited warranty and a 110 mph wind warranty.