Premium zirconium grain Fast cutting action and long life Hard plastic backing has a longer life than fiberglass backing High productivity flap disc that grinds, blends and finishes Exceptional value and performance Encore Plus has a premium zirconium grain that provides fast grinding and reliable finishing performance. Hard plastic backing has a longer life than fiberglass backing. Exceptional value and performance. Type 29 (conical) discs. Used for stainless steel, high-tensile steel, titanium, ferrous metals (iron, steel, welds) and non-ferrous metals (aluminum, copper, brass). Package of 10. *Note: 20% restock fee on all SAIT/United Abrasives returns.