... ring 1.made of 100% rubber material 2.complianted with RoHS approval. 3.oil proof Haining SiKe Rubber Co., Ltd is the high ... , auto and motorcycle parts, oil drilling and mining rubber parts and other rubber products. The material of these products are NBR, NR, EPDM ... , FKM, SILICON RUBBER, NYLON, PU, CR, SBR, EP, IIR etc ...