The Primo flat brush wheel is a quality abrasive available in 4 grits: 280, 400, 800 and 1000. The colors make it easy to distinguish the grid at a glance. These are quality abrasives and great for creating satin finishes. The flaps are made of a durable material so they're very long-lasting. Go to Stuller.com today to find the Primo flap wheels and other fine tools.