Small batch is always an even mix of Floral ("O") and Full Bodied, Light Spice/Caramel (K") yeast strains and high-rye (35%, "B") and low-rye (20%, "E") mashbills (both with 5% barley) versions of Single Barrel, as detailed at http://bourbonr.com/blog/four-roses-mash-bill-breakdown/ I may prefer this over the Single Barrel - at least for the low-rye (E), herbal (F) OESF recipe I had tried.