most all stocks are 65% density, which fits a wide range of people, they also have some wave to them. so if you wanted 55% density and no wave at all, a stock would not work well for you. a custom system is one where you can order any density, any color, any size/shape. a stock comes 8x10 and you can cut it down to fit, comes at about 65-70% density and has a wave to it...again...to appeal to a wide range of people.
DebbieS.
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