We struggle for creating an environment conducive to innovation activities, to enhance our innovation capabilities, and thereby increase the added value of our Bulk ED ring in NBR, Coating O Ring, white PTFE Back-up Ring. Zhonggao Seal Technology is one of the leading Oil Seal manufacturers and suppliers in China. Our factory has a wide varieties of Oil Seal products in stock. Please be free to buy the bulk products from us. And we will also offer the customized service if necessary.