The Haydn® Cork sanding blocks are traditional back blocks designed for hand sanding jobs. Made of compressed cork, they offer the right balance of stiffness for efficient sanding and flexibility to smooth out minor imperfections, ensuring that changes in the wood are also addressed. These blocks work in conjunction with sandpaper sheets, speeding up the sanding process and ensuring the entire piece of sandpaper is utilized. Additionally, they can be easily carved into various moulding shapes, making them a useful and cost-effective option.