3/4 X 12 Inch Medium Knife Sharpener Sanding Belts, 10 Pack. Compatible with Work Sharp Knife and Tool Sharpener Ken Onion Edition (WSKTS-KO) only. Premium ceramic (80 grit) and premium Aluminum Oxide (120-5000 grit) metalworking material designed for knife sharpening and grinding. Flexible, J-weight polyester backing. Industrial abrasive belts combine a precision cut with long life. Premium Bi-directional tape joints allow belts to run either direction. Assembled in the USA by Red Label Abrasives.