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Torino Pro #570 - This is a medium hard. The #600 is firmer than the #570 and also firmer than the #450.The #970 is the firmest of all. So the #570 is the "softest" of all the medium hards in this line up.
From hardest to softest this is how these brushes feel > 970, 600, 570 <
The #570 has really good pull but also won't hurt your scalp.