Mirka® Abrasive Sanding Sponges, Low Density, 100-PackMirka's Low Density 3 x 4 Inch Colour Coded Sanding Sponges for Perfect Finishes Mirkas Low Density 3 x 4 Inch Sanding Sponges are known for their versatility in both thickness and grits, making them an essential tool for any sanding project. These high quality abrasive sponges are designed to be used either with power tools or by hand, providing flexibility for detailed sanding work. Each sponge is color coded by grit, allowing for easy