1.LSB specially produce the o-ring,x-ring.rubber parts 2. Material: FFKM,NBR, HNBR,EPDM,SI,FKM(VITON)CR, ... ,FDA ,UL ,KTW,W270, ROHS, SGS .5. Packing: neutral or as per client's requirement.6. Colour: red ,white,black ,blue ... on your size9. Different sizes and color can be make on your requirement ,but o-ring's mold fee is free. industrial rubber ...