Dream Blue M6+ is an upgrade version of M6 in the following 

aspects:

More aged base liquor is used 

Bigger Volume (50ml more than that of M6)

Luxury design

Enhanced anti-counterfeiting

M9 is produced in the core area of Dream Blue production region. From production to selection to storage, M9 follows a very strict procedure. About every 50l of quality original baijiu can only produce 50ml M9. Each bottle of M9 is at least 20 years old. The liquor is stored in small pots for 8,000 days in the century-old underground cellar. It features yellowish color, fragrant odor, and a mellow taste.