Kinetic OSO Fresh 8-Piece Fresher Food Storage Container Set with Silver Science Technology Makes food last longer and stay fresher, Includes 4 containers with 4 lids Micro-sized silver particles infused into the containers protect against bacterial growth Keeps food fresher than any other brand Airtight locking system seals in flavor and reduces spoilage BPA-free, thick, and durable plastic (EPA registered and FDA approved)