Square containers store up to 25% more on a shelf than round containers. Break-resistant. clear polycarbonate for visibility and long life. Smooth interiors for easy cleaning. dishwasher safe. Precise measurement graduations red for U.S.. blue for metric. Easy-grip. pocket-style handles with drain holes. Stack in use and nest for compact storage. NSF Certified. Temperature range: -40F/-40C to 212F/100C. Lids and containers (sold separately).