The Rainbow design typifies Urban Accessories' effort to take ordinary utility grating and transform it into something more elegant and refined. The Flat Rainbow Drain Cover comes in a variety of materials: It comes standard in 100% Recycled Grey Iron, per ASTM A48 class 35b; Ductile Iron, per ASTM A536, class 65-45-12; 100% Recycled Aluminum, per ASTM B26; Silicon Bronze, per ASTM B26; Nickel Bronze, per ASTM B30. There are also a variety of finishes: The standard is Raw Natural Finish; Rust Conditioner – Grey and Ductile Iron Only; Polyester Powder Coat – Standard color options; Liquid Coat – Available upon request – Please provide paint color number, system number, and manufacturer; Brush – Aluminum, Bronze, and Nickel Bronze Only; Polish – Aluminum, Bronze, and Nickel Bronze Only.