Usage:
ribrepr style atom-spec

Ribrepr controls the representation of secondary structure ribbons. Possible style settings include:

Additional styles created and named with the Ribbon Style Editor can also be used. Other ways to switch among ribbon styles are with the Actions menu and the molecule model attributes panel.

Even if only particular atoms are specified, the ribbon segment(s) corresponding to the entire residue(s) containing the atoms will be affected.

See also: ribbon, ribbackbone, the Ribbon Style Editor