Once you apply rod finish with a fine sable brush its hard to go back to the cheap plastic brushes. These sable brushes are made in the U.S. and feature a flat shaped head, that is perfect for spreading rod finish. Be sure and pick up some brush cleaner to care for the brush. With proper cleaning, these brushes will last many years. At $3.95 a piece they are much cheaper in the long run than their disposable counterparts.
The size 8 is perfect for larger rod or for applying finish over a long surface. I like to use the 8 on my spey rods. You get great coverage and control.