The HP transfer roller RM1-4279-000CN is a printer component used in the image transfer system. The service manual identifies it as a transfer roller within the HP LaserJet M2727 MFP’s internal components.
The distributor describes the same part as a transfer charge roller and lists it for the HP LaserJet M2727 MFP, M2727nf and M2727nfs, as well as the P2010, P2014, P2014n, P2015, P2015d, P2015dn, P2015n and P2015x. It is a replacement component for those listed printer models.