... :ShoreA 50,60,70,80,90 Color:black,red,brown NSF,WRAS,TZW,W270,FDA ItemNR o-rings sealing ROHSDescriptionHardness:ShoreA 50,60,70 ... ,80,90Color: black,red,brown etc.AdvantageGood Ozone resistance, aging resistance, high/low temperature resistance, acid/alkali resistance, weather resistance ...