Designed to store up to 75 percent more material in the same footprint as conventional shelving, Space-Trac mobile shelving systems improve storage efficiency, yet cost about the same as conventional shelving. These high-density, light-duty modular storage systems boast a special sliding carriage design. Wheels with automotive-grade ball bearings glide smoothly along rugged 6061-T6 aluminum guidance tracks, even with fully loaded shelves. All Space-Trac components are made from high-quality materials and are assembled in the US. Info: Space-Trac, Space-Trac.com.