WRI guide ring is made of special PI material can be rod, hole dual purpose guide ring. The design of diagonal cut is convenient for installation. Due to the special properties of its material, it has a very high heat resistance temperature, and good high temperature stability, and a wide range of application. The extremely low friction coefficient, combined with the oil circuit design on the surface of the guide ring, eliminates the abnormal noise in the reciprocating operation. At the same time, the wear resistance is excellent and almost no maintenance is required during the service life.