The RidgeMaster Plus is perfect for all roof pitches from 3/12 to 12/12. Patented pitch shows more shingle profile and less vent opening. Blends perfectly into roof lines. Patented internal baffle system prevents insects, leaves, pine needles, blowing snow, and rain from entering. Can be used with asphalt, metal, and synthetic roofing materials. Dimensions 11" RidgeMaster Plus: 4' x 10-5/8", bottom edge width, x 1-3/8", bottom edge to peak; 7/8" ventilation opening. Limited lifetime warranty.