seeds Hoffman's Seed Starting Mix...What's in it?

This seems to be a popular seed starting mix, so, I briefly perused the Net looking for a list of ingredients, but, came up empty.  Apparently, it has "6 Components Blended In Proper Proportions".  Any info on these mystery components?
 
Per Amazon: Canadian sphagnum peat moss, horticultural vermiculite, limestone (PH adjuster) wetting agent.
 
In the amazon reviews a few people stated seeing "twigs" which means it also has composted tree bark, forest humus, or something similar.
 
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