This high quality airtight silicone can cover securely seals tins jars bowls and other containers with a diameter of up to 10cm the suction effect creates a tight seal meaning the contents of the container remain secure while helping to keep your pets food fresher for longer the silicone can cover also prevents unpleasant smells from escaping how to use place the cover on top of an open container and slightly push in the centre this forms the airtight vacuum seal to remove lift up