food grade colorful o ring Hardness:Shore40,50,60,70,80,90 Approved:NSF,FDA, ... o ringDescriptionMaterial: SiliconeHardness:Shore40,50,60,70,80,90Color: black,white,red,green,yellow,blue,brown,orangeAdvantageAging resistance, high/low temperature ... cmNot-standard packing: follow customers' requirement food grade colorful o ring with high quality approved NSF61,WRAS,UL,FDA,ACS,UL ...