Ply count refers to the total amount of layered cloth pieces used in the buffing wheel construction. Typically, 40 ply buffing wheels would be a bit under a 1/2 in thickness. Stitching is measured either in total concentric rows of sewing or the inches in space between each row of sewing. Keep in mind, the tighter the the sewing, the more aggressive and tight the buffing wheel will polish.
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