Features: 1) AS-568, PG, DIN, BS standard and non-standard Silicone O-Rings 2) Various colors available Features:1) AS-568, PG standard and non-standard Silicone O-rings 2) Various colors available, such as black, green, yellow, blue, red 2) RoHS directive compliant green products3) Available materials: silicone, fluoro silicone, viton(FKM), neoprene, HNBR, NBR+PVC, NBR, natural rubber, SBR, IR, ...