grading is pretty meaningless as it is not standardized. everybody wants to call their brushes 'silvertip' so that they can charge more for them, but I'll take simpson's best any time to most 'silvertips'. There's a lot more to a brush than the color of the tips, e.g. if they've been trimmed, what is the density of the knot, the stiffness and the length of the bristles, how deep the knot is set in the handle...
If you can, please post links to the particular brushes you want more info about so that you get correct comments
