Line width
From PyMOLWiki
Overview
Controls the width that PyMOL draws lines.
Sytnax
# set line width set line_width, value # set line_width to value for object or selection, objSel set_bond line_width, value, objSel # Example load $TUT/1hpv.pdb as lines set line_width, 10 # or on a bond-by-bond basis, set_bond line_width, 7, i. 20-30