They are made from polymer materials such as nylon, Delrin (polyacetal), high-density polyethylene (HDPE), PTFE (polytetrafluoroethylene), and PEEK (polyetheretherketone). Known for their lightness, corrosion resistance, low friction coefficient, and ability to operate without lubrication, they are widely used in the food, pharmaceutical, and electronics industries, where cleanliness, chemical resistance, and quiet operation are essential. They stand out for their versatility and durability in various operating conditions.