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I am pretty certain it means how the brush is assembled using certain hairs in bands in the circular knot. They grade the hair and test it somehow. They integrate stiffer and ones with other...

As far as the Thater 2 band, you definitely get what you pay for. Worth every penny! The 2 band knots from TGN are also great, as Dave says. I wish they would come up with a larger knot than 24mm....