Straw pellets, perfect as a base for all of your oyster mushroom family. Hydrate to around 60 - 65% with boiling water, let cool and you're ready to add oyster grain spawn and start growing. Alternatively, supplement with 20% wheat bran for bigger, better yields - although this blend will need to be steam pasteurised in a barrel steamer or similar, or sterilised in an autoclave to fight off contamination.