10 x Mushroom spawn grain growing bags heat sealable high temperature Polypropylene bag with self reselling injection port 10 x 8.5cm x 50cm (4" x 3" x 20") sized bags are suitable for 1kg -1.5kg / 1.65- 2.5L of grain or seed of choice. High quality heavy gauge 0.06mm substrate bags with 0.02 micron filter patch allowing air to pass in but not bacteria. Suitable for all types of grain and seed for sterilisation in autoclave and inoculated by syringe with all types of liquid culture.