BUILT TO LAST: Made from industrial grade PPC (polypropylene copolymer) material, these are highly robust and perfectly suited to a busy commercial kitchen. Additionally these have rounded corners to further protect from impact damage if dropped. TEMPERATURE RESISTANT: With a working temperature range of -30C to +90C these will remain functional and retain their shape in all but the most extreme of temperatures. VENTILATED SIDES AND BASE: Ventilated sides allow for quick drying of contents whilst the smaller holes in the base prevent any loose cutlery from falling through. COMPATIBLE WITH COMMERCIAL DISHWASHERS: 500 x 500 mm size means that these will fit into to most commercial dishwashers with ease