This mirror is fabricated from 18-gauge type 304 stainless steel which unlike 430, will not rust. The corners are tightly mitered and the edges are protected by cushioned 3M adhesive strips to prevent damage. Backs are secured by continuous industrial adhesive sealant and a galvanized steel back plate for added rigidity. The one-quarter inch float glass mirror is silvered and copper-plated by galvanic process and carries a full 10 year warranty against silver spoilage. The mirror dimension is 18-inches wide by 30-inches tall. This product is manufactured in the USA using USA labor and USA sourced raw materials.