Every single curve and surface on each block has been designed for a purpose. * Soft, rounded edges virtually eliminate gouging. Blocks 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.