... available Features:1) AS-568, PG standard and non-standard Silicone O-rings 2) Various colors available, such as black, green ... , blue, red 2) RoHS directive compliant green products3) Available materials: silicone, fluoro silicone, viton(FKM), neoprene, HNBR, NBR+PVC, NBR, natural rubber ... physical property6) Customers' designs and specifications are acceptedPacking:500pcs/bag silicone o-ring