Wood is a natural material that changes constantly throughout it's lifetime. It responds to changes in humidity so it's moisture content changes regularly. When this happens to raw wood (without seals or paint) it can create a slight roughness to the surface which may require smoothing over time.
Using a low grit sandpaper is the best way to smooth any raw wood surface and restore it. It is also helpful in removing certain stains and marks that can occur over time.
Price is for 1 sheet of sandpaper.
*This product is intended for use by an adult. If using with children, do so under adult supervision.