Self-sharpening Norzon (alumina zirconia) abrasives will have you sailing through twice as many sanding projects as ordinary belts, in half the time. Open coat for reduced loading, and bi-directional splicing, so the belt can be used in either direction to extend its sanding life. Yes, they cost a little more, but you'll more than make up for it with the savings in time and money. Made by Norton. Box of 5 belts.