Gator Ultra Power Premium Series sandpapers with Black Zirconium, from Ali Industries, are designed to be used on power sanders. They say the use of the hard manmade material black zirconium (sometimes known as cubic zirconium) makes these sandpapers shaprer and harder than aluminum oxide grits, to cut faster and hold the cutting edge longer. The Ultra Power series comes in various configurations and is available at hardware stores; pricing on packs for 5” random orbit sanders, for example, starts at a four-pack for $4.99.
