R-BLADE Pergola with louvered roof is the ONLY louvered structure in the market that offers high standard quality: 1. Large dual-wall louvers for better resistance and a bigger opening 2. Gapless (louvers seal with the gutter when closed) 3. High Drainage Capacity (the water flows directly into the posts) 4. Invisible gutter in one full extrusion (no leaking). European design and quality, made in the USA.