A linear-motion bearing or linear slide is a bearing designed to provide free motion in one dimension. There are many types of linear motion products of high precision quality that contribute to the size and weight reduction of machinery and equipment. One of the main advantages of linear systems is the dynamic friction of the ball or roller elements is substantially lower than that of full face surface sliding friction. Since the difference between dynamic and static frictional resistance is small, motion response is excellent in terms of positioning accuracy and in high speed applications with acceleration and deceleration. Linear motion bearings are also designed for the rolling elements to achieve extremely smooth motion. The raceway surface is finished by precision grinding for high precision movement with optimal clearance.