These syringes are cultivated in a sterile environment using aseptic laboratory techniques. Each master culture has been tested to ensure that there are no contaminants when in your syringe. The master cultures are comprised of a honey solution and then are sterilized before inoculation to ensure that they are and remain sterile. You will receive a 10CC syringe with a sterilized 18g needle so you can immediately inoculate grain spawn bags, jars, etc if you so choose. Your syringe is guaranteed to contain a live culture, and if there are any problems please reach out to us so we are able to resolve your issue. *Syringes can be stored in refrigerator for future uses and to stall the growth process within the syringe* ** PINK OYSTERS CANNOT BE REFRIGERATED, THEY WILL PERISH**