Richard Tools' 9 in. x 4 in. x 3/4 in. Rectangle Sanding Sponge is constructed with a flexible foam core that adapts to various contours, allowing you to tackle both flat and curved surfaces with ease. Its resilient design holds up to repeated use and provides consistent results without clogging or wearing down quickly. Ideal for both professionals and DIYers, this sanding sponge ensures precision and smoothness in drywall work, making it a go-to tool for anyone looking for an efficient, high-quality sanding solution.