The 3M Sanding Block is great for a wide variety of sanding applications where moderate flexibility is needed.
Medium to firm density open cell polyurethane foam center provides uniform support and moderately aggressive cutting action while generating a smooth surface.
Coated on 4 sides - 2 sides with a medium grit, 2 sides with a coarse grit.
Sanding Bar measures 4" x 2-3/4" x 1"