REINFORCED WALLS ADD STRENGTH AND RIGIDITY AND WIDE TOP LEDGE PERMITS STABLE, HIGHER STACKING. CONSTRUCTED OF WATER AND CORROSION PROOF POLYPROPYLENE, THEY WITHSTAND FREEZERS AND AUTOCLAVES FROM -40°F TO 250°F. FDA COMPLIANT RESIN & COLORANT. FRONT, BACK AND SIDE GRIPS ALLOW EASY HANDLING. MOLDED-IN FULL-WIDTH REAR HANGER LIP ALLOWS BINS TO HANG FROM LOUVERED PANELS OR RAILS. ANTI-SLIDE STOP PREVENTS SHIFTING WHEN STACKED. SLOTTED LABEL HOLDERS ALLOW EASY IDENTIFICATION OF CONTENTS. MADE-IN-USA.