Lasts up to 3 times longer than the standard coated hand sanding sheet - High quality metalwork requires a high quality finish - and for that you need a good, consistent abrasive. The Expert N880 isn't just good when you first take it out of the box. It stays good over a long lifetime and delivers an even finish. The Expert N880 fleece disc is an example of Bosch Surface Structure: it combines the latest sanding technology and manufacturing expertise in a single, extra-durable fleece. The three-dimensional product with cross-laying technology saves professionals money thanks to its long-lasting performance. Plus, they no longer have to fret about hand sanding sheets that lose grit. Whether you're finishing a metal component with precision, cleaning a workpiece or sanding a hard-to-reach surface, the Expert N880 is the best choice for the long haul. Easy to attach with Velcro fastener. Grit size: 120, hardness grade: medium, diameter mm: 125