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 | Each grate has three stepped diameters to fit Sewer and Drain (S & D) Pipe and Fittings, Triple Wall Pipe and Corrugated Pipe | 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