Shingles are made of 28 or 26 Gauge Galvanized Steel, or Painted in Color Brown Charcoal or White, 50 /Bundle or 100 /Bundle. Flat Shingles are used for weatherproofing around chimneys, skylights, and dormers. They can be bent, cut and shaped. For architectural, residential, and commercial roofing. ASTM A-653, ASTM A-792