Starmer Boilies contain absolutely no preservatives and they don't require freezing either. This is done by way of our special flavour lock system where by the flavour and nutrients are only released when you want them to. Simply open the bag, use them, close the bag when you’re done and there ready to go again as soon (or late) as you are. No more worrying about defrosting your bait before hand, no more worrying about keeping it frozen, and no more worrying about shelf life and preservatives.