PRESERVE YOUR ART - Crafted from Bright White 100% Cotton Museum Board, these mats ensure your 11x17' prints are protected from acid migration, maintaining their quality over time. PROFESSIONAL PRESENTATION - The 16x20' mat size provides a standard frame fit, while the precise 9-7/8x14-7/8' opening showcases your 11x17' artwork with a clean, gallery-worthy look. ARCHIVAL QUALITY - Made with acid-free materials, these pre-cut exhibition mats prevent yellowing and deterioration, safeguarding your cherished photos and artwork for generations. READY TO USE - This 5-pack of pre-cut mats saves you valuable time and effort, offering convenience and consistency for framing multiple prints in a uniform, professional style.