spawn jar ingredients

Whats the best spawn jar ingredients an their ratio?

http://www.ebay.com/itm/Rye-berries-mushroom-substrate-grow-bag-2-1-lb-bags-new-/180624635264?pt=LH_DefaultDomain_0&hash=item2a0e113580


I like these. already sterilized and with the right amount of water and they have a breather on them.

Depends on what grains you decide to use (WBS,Popcorn,Rye seed, etc.)

Here is a good tutorial on preparing WBS.

http://www.youtube.com/watch?feature=player_embedded&v=jmaTX3kiPow