National Abrasives, Inc. is your source for economy discs A/O in a wide range of sanding applications. We offer flat pack PSA discs in boxes of 100 and flat pack grip discs in boxes of 50 — both are available in grits ranging from 80 to 400g. Economy discs offer an affordable disc solution that is friendly to even the tightest budgets. These top-quality discs will also meet your high standards for performance and reliability. They’re a great way to bolster your disc inventory without having to spend a lot of money!