Sterling Instrument (New Hyde Park, NY) has introduced the S99GWRM40 and S99GWRM80 series linear guide rail systems. The sliding element is a specially formulated polymer material suited for hard-anodized aluminum rails. The combination of the two yields low abrasion. The carriage and rail combination is a compact design, and the low, wide profile withstands high torque. They are stocked in lengths of 1,000, 2,000, and 3,000 mm. Both the size 40 and size 80 series rails are made of hard anodized aluminum. The carriage assembly for both series consists of an aluminum plate, die cast zinc blocks, and J® Polymer bearings. The overall height of both series is 24 mm.