The gutter cover is designed with 2 flexible beads that bend to fit up to a 14-12 pitch roof. Water flows around the nose of the solid gutter cover and into the gutter through the slotted channel. It will handle the heaviest of rainfall. Helps keep leaves, pine needles, and other debris out of the gutter. Made of a rigid PVC. Easy-to-install. Starting at one end of the gutter, slightly lift the shingles and slide the back edge of the gutter cover under the shingles, then pull the front edge over the lip of the gutter. The flexible back edge bends to match the pitch of the roof while the flexible front edge angles slightly forward to allow proper water flow. No special tools required. Fits standard 4", 5" and 6" metal gutters.