PS disposable plastic cutlery 1.PS knife,fork,spoon, ... ), though steel was always used for more utilitarian knives, and pewter was used for some cheaper items, especially spoons ... days 3.Very strong and durable 4.Suitable for hot and cold foods 5.Excellent design and ... renewable materials and unlike plastic, does not harm the environment. PS disposable plastic cutlery for hotel,fast food,airline