After the biodegradable airsoft bb reaches the user's hand, there are recommendations for storage to the customer after packaging. The desiccant has been put into the plastic biodegradable airsoft bb. Therefore, if the packaging is not opened, the plastic biodegradable BB shell can be The degraded airsoft bb that has been stored for a long time, but the packaging is not opened, cannot be exposed to sunlight, so that it can be stored for a long time. If the airsoft bb has been unpacked, it is recommended that it be used immediately if it cannot be used. It is necessary to cryopreserve the biodegradable airsoft bb because the cryogenic bacteria will not survive, thus prolonging the retention period of degraded airsoft bb.