Measuring 5.49 x 18 x 219mm SAM50 Primed MDF Windowboard provides a smooth, stylish, and durable solution for finishing your windowsills. Its clean, contemporary design complements a wide range of interior styles, while its robust construction ensures long-lasting performance. Made from high-quality MDF, the SAM50 windowboard is highly resistant to warping, swelling, and splitting, even in areas with changing moisture levels. The moisture-resistant MDF provides excellent stability, while the smooth, factory-applied primer creates the ideal base for a professional paint finish.