... .WRC ,FDA ,UL ,KTW,W270, ROHS, SGS .5. Packing: neutral or as per client's requirement.6. Colour: red ,white,black ... . Standard:AS568,DIN3771,JIS B2401,ISO3601,BS1806.8. accept sample or product drawing on your size9. Different sizes and color can ... your requirement ,but o-ring's mold fee is free. industrial rubber oil ring