I've done some research to determine what exactly went into making the rubberized strop component but haven't found anything yet. The leather component is medium smooth with medium draw, not slick nor rough. Both components on mine are still useable but have seen better days. The Neil Miller leather will definitely be a nice addition but the rubberized strop will take some thought to figure out and replace out because whatever is in there is not topical. Neoprene saturated in CBN or diamond? Maybe.