Hi Retta,
Here's a copy and paste of Val's comment on the brush from another post - if you ever get one, would love to hear how it works for you too
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Denise, when it comes to brush sizes....there can be a big difference between manufacturers. For instance, I know the #8 squirrel mop from W&N is much smaller than the #8 Isabey that I have.
As for the spring, the squirrel hair is quite relaxed in comparison. It's really fun to muck about with, you can get everything from a very wide line, right down to a pencil thin line all in the same stroke. I've been using it as an experiment for painting the iris. It is quite the learning curve with water control. The brush holds so much! Fantastic for large washes, after I finish this painting I think I'll reserve it for just that until I can get a good grip on how to better utilize the brush. Otherwise I can see a lot of wasted paint.

Had I been purchasing this brush, I probably would have gone one size smaller.
Here's a photo of my brush....