From the Producer's Website:
PiggyBack 100 Proof Bourbon gives our bold approach to whiskey a sweeter spin. Born from our signature grain’s other half, it starts with a high Corn mash bill (keeping a dash of Rye of course). Six long years of age in Char #3 barrels adds layers of flavor before bottling at 100 Proof, so you can keep it 100 whether you choose Bourbon or Rye.
Sip it neat or shake it in a classic. With its sweeter profile, PiggyBack 100 Proof Bourbon shines in citrus and sour drinks – like our Barrel Aged Maple Bourbon Sour.