6inch Solid Hook-n-Loop Redline Aluminum Oxide Rhynogrip Disc 320 Grit INDASA Redline is specifically designed for automotive refinishing. Features: Durable C-Weight paper with high tear resistance and increased life Anti-clogging lubricant that resists loading extending cut life Hook and Loop design makes for quick, easy change-out of papers Grip design runs cooler than PSA design Back of Disc indicates Grit size, 50 Discs/Box Made in Portugal