Pearl Abrasive's Top of the Line Zirconia Resin Fiber Disc.  The CoolMax™ Zirconia Resin Fiber Disc is has a specially formulated Zirconia abrasive grain that features a "top-size" cooling agent leaving you with an extremely long lasting fiber disc grinds cooler than standard fiber discs.  These Fiber Discs are excellent on Ferrous Metals including Iron, Steel, and Stainless.  Call TAP today to see which fiber disc is right for you!