Such slides have been around for a long time, and are the first generation of silent drawer slides. Since 2005, the new generation of furniture has been slowly replaced by steel ball slides. The structure of the roller slide rail is relatively simple. It consists of one pulley and two rails. It can cope with the daily push-pull needs, but the bearing capacity is poor, and it does not have the function of buffering and rebounding. It is commonly used with computer keyboard drawers and light drawers.