400 Grit Aluminum Oxide 6" Expander Wheel Belt, per belt or by the box (10 in a box)
Aluminum OXIDE (AO) - Most economical, good for buffing and tool maintenance
Often a brown material, used most often for maintenance of tools with finer grits (100, 120 and up). This material will not have good life when used to grind shoes or steel with coarser grits.