Yunsheng founded in 1997 is a professional and special manufacturer, distributor and service company of oilfield down hole equipments and is one of ISO qualified international supplier. With more than ten years' experience in oilfields, we offer a complete range of API sucker rod and couplings. We have 20 production lines, and can offer 1,5000 pieces each month Our company is located in Laishan Shengquan Industrial Park ,beautiful seashore city-Yantai Port ,to north adjacent to Yantai Port, to south next to Yantai Airport , with beautiful scenery ,comfortable climate and convenient traffic. Furthermore ,our company has fixed assets RMB 10,000,000,00 yuan, 150 employees, among them there are 26 engineers, it covers 30000 square meters, and construction area is 15000 square meters. Main products :deflection –proof and abrasion –proof sucker rod coupling ,and T coupling .our company owns the advanced technology, especially the alloy coat abrasion –proof sucker rod coupling is on top level of the world.