The Scotch-Brite™ Star Pack is a robust introductory set of abrasives that contains everything you need to blend, deburr, and finish those hard-to-reach internal diameters of things like metal tubes and piping. Each star has six spindles attached to an eyelet. Made with nonwoven technology, the spindles are spongy, buoyant and flexible. Consequently, they can bend and move to accommodate the insides of metal tubes and pipes.