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S & B, try looking at AE's web site, they have a chart that give what each # is recommended for, it does not give you what is different but what is the best use (i.e. style of raing for each #)
 

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hmmmmm a r "eee" dy brush huh? whats the difference between a reedy brush and a reeedy brush? thats the real question... dont be a skull ....bones.... he he
 
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It used to be that the lower numbered brushes contained less silver while the higher numbers contained more percentage. But with the introduction of the 728 4cell brush I'm not so sure if that is still true. I do know the 729 produced less power and wear than the 737 or 738 brushes.

The Associated site doesn't list the brushes in order of compound percentage just type of uses which isn't the best when trying to select a brush based on percentage of graphite, copper or silver.
 
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