Square containers store up to 25% more on a shelf than round containers in the same space. Break-resistant clear polycarbonate for visibility, long life. Smooth surfaces for easy cleaning. Dishwasher safe. Precise measurement gradations in red/blue. Nest for compact storage. Temperature range of -40ºF to 212ºF. Made of FDA compliant materials. USDA Meat & Poultry Equipment Group Listed. Certified to NSF Std. #2.