High-performance longboard sandpaper roll with a PSA pressure-sensitive adhesive backing and an easy-to-peel-off backing liner to protect the adhesive backing.. high-quality sandpaper types that provide exceptional sanding performance, so you can get the job done fast. 40 GRIT. Roll may be cut and shaped to meet project needs and dimensions. Superior quality longboard sandpaper made with super coated aluminum oxide corundum that's fused with zirconia alumina.