Check the listing for details. Alpha Tools Hook & Loop Sandpaper Discs (50 Per Box). Color: Multicolor, Condition: New. Listed at 35.95 USD. Alpha® Sandpaper discs consist of a waterproof hook and loop backed material combined with a silicon carbide abrasive, which is the perfect combination for use on marbles and softer types of natural stone. Marble fabricators find Alpha® Sandpaper to be effective and durable. Tile contractors find Alpha® Sandpaper to be very adaptable to onsite work and easy to use. Restoration workers can polish wide areas quickly without difficulty. Alpha® Sandpaper resists clogging when used wet, thus extending the life of the disc. The discs can be used dry if necessary and are very durable. The hook and loop backing makes disc changes simple. Silicon Carbide is the abrasive of choice for sanding and polishing marble, travertine, terrazzo and onyx. Alpha® Sandpaper can also be used to polish glass, metal and wood. When used with our standard backer pads or the GV5000 backer pad, Alpha® Sandpaper is sure to give you the best results. For an extra high glossy finish, use the Alpha® Felt Wheel with a buffing compound to finish the polishing process. Waterproof Hook and Loop Backed Silicon Carbide AbrasiveResists Clogging When Used WetUse On Marbles and Softer Types of Natural StoneVery Adaptable To Onsite Work and Easy To UseCan Also Be Used To Polish Glass, Metal and WoodGreat for Multi-Purpose Sanding of Bondo, Primer & PaintAvailable in 4” and 5” Sizes (Boxes of 50)Grits Available: #80, #120, #240, #320, #400, #500 and #600Grit Indication is U.S. Cami Grit System