Lakes mono-metal liner has its inner bore quenched with the carburized layer thickness as 1.5 to 1.8mm to achieve hardness of 58 to 60 HRC. The liner features high hardness, great corrosion resistance, no deformation and high surface finish. It can be applied on Gardner Denver duplex pumps such as FY-FXD7-1/2X10 series, FC-FXX5X8 series, FD-FXX5X10 series and FG-FXG5X6 series, etc. The outer sleeve of Rundongs bi-metal liner is made of forged carbon steel and features great wear resistance, while the inner sleeve is made of high-chromium alloy cast iron and features great resistance to wear and corrosion. Through thermal treatment, the inner sleeve reaches hardness of 61 to 64 HRC. In general, the service life of our bi-metal liner is 800 hours. The liner has won a great reputation among many oil fields. Our ceramic liner is made of toughening zirconium oxide with fracture toughness (K) ranging from 10 to 15 Mpa, which is about 10 times of that of traditional ceramics. In addition, the liners flexural strength() is ranging from 600 to 800 Mpa, the Weibull modulus is 18m and the elasticity modulus (E) is 200Gpa. The ceramic liner features excellent resistance to wear and corrosion. Its average service life is longer than 3,000 hours, which significantly reduces the cost of well drilling.