Yantai Yunsheng Petroleum Machine Accessories Co., founded in 1997, presently is one of the biggest enterprises producing double protection sucker rod coupling in China.My company locates in Laishan Shenquan Industrial Park, beautiful seashore city-Yantai, with beautiful scenery, comfortable climate and convinent traffic, it has fixed assets RMB10, 000, 000.00yuan, 150employees, among them there are 26engineers, it covers 30000 square meters, and construction area is 15000 square meters.we offer Main products:deflection-proof and abrasion-proof sucker rod coupling, it is in all types and sizes, made of good quality steel alloy 40cr, and it`sfunction is wear-proof, corrosion-resisting and reducing the friction.and they are made according to API11B standard.We can offer you the better quality, lower price of the coupling.Hoping we can do business with each other for win-win situation, if not , we also can make friends.Best wishes, Yantai Yunsheng Petroleum Machine Accessories Co., Ltd.International partMelodyPhone:0086-535-6908536Fax:0086-535-6908536e-mail:xxxxxmsn:xxxxxskype:melody-guo1web site: http://xxxxx