WHILE SUPPLIES LAST!!! Designed to use with adhesive-backed sandpaper. Also works great with non-adhesive wet or dry sandpaper. Every single curve and surface on each block has been designed for a purpose. Soft, rounded edges virtually eliminate gouging. Block glide over varying surface levels like a carwash mitt without flipping over. Zero-fatigue blocks are super lightweight and designed to be comfortable no matter how you hold them. Blocks are soft & pliable yet extremely durable plus they are resistant to most solvents. Tapered edges of blocks allow you to sand up to and underneath those hard-to-access areas. Corner-N'-Cove™ block with its offset handle allows for a clear view of the surface being sanded. Six blocks of three different densities vary in firmness and yet all are soft enough to be distorted or compressed into places that are hard to sand.