Great burr for the detail carving.  As with all Duragrit Tungsten Carbide Burrs, they virtually last forever.  They are all a "GREEN" product.  As you don't have to continually replace them when they become dull.  Just clean them up with a file card and burr cleaner and you are ready to use them.

All the detail burrs come in three graduated grits.  Starting with 80, proceeding with 120 grit and finish with 240 grit.  Use in sequence to alleviate all scratches for the finest finish.