special locking system,PP/random raw material,resistant to heat changes,various models,competitive price/quality. It is %100 air and liquid tightness. It keeps the food fresh for a long time. It shows everything at one glance, neat and clean. It increases the capacity of your refrigerator. It prevents mixing food's smells. It can be safely used in microwave ovens and deep freeze and highly resistant to heat changes, and also it is harmless to human body. It can be safely washed in dishwashers, surface doesn't stretch during washing.