Manufactured from structurally foamed High-Density Polyethylene (HDPE) - UV stabilized to protect from sun degradation | Flat and atrium (domed) profiles - Flat grates available in green and black - Atrium grates available in green and black | Fits 9", 12" and 18" Square Catch Basins - Fits 9" and 12" Square Low-Profile Basins | Textured anti-skid surface - Load rated for pedestrian traffic - Load rated for autos and light trucks at speeds less than 20 mph | ADA compliant - Made in the USA