The Breakdown:

Hand-rolling a joint can be difficult and tedious and take a while to produce the consistency many customers enjoy.
Many customers turn to buying pre-rolled joints or marijuana cigarettes at their local medical marijuana dispensary or retail marijuana store. Convenience is key.
There is a new joint rolling service coming to marijuana dispensaries as well as marijuana growers and product producers in states with medical and recreational marijuana.
Rollies, LLC will be offering a service where they can take their client's best selling strains and make pre-rolled "perfectly and evenly filled cannabis cigarettes of different sizes and formats" in high volumes.
Rollies won't be hand rolling tons of marijuana cigarettes for you... they have large scale table-top filling machines, each capable of producing over 300 per hour.
This allows dispensaries to sell consistent pre-rolled joints of their top-selling strains with a fraction of the in-house rolling costs.
Rollies, LLC is a wholly owned subsidiary of mCig, Inc. (OTCMKTS:MCIG).
References & Further Reading:
Press Release: "MCIG Rollies Announces a New Service for Marijuana Cigarettes" (Market Wired)